CN104021579A - Method and device for changing colors of image - Google Patents
Method and device for changing colors of image Download PDFInfo
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- CN104021579A CN104021579A CN201410256476.1A CN201410256476A CN104021579A CN 104021579 A CN104021579 A CN 104021579A CN 201410256476 A CN201410256476 A CN 201410256476A CN 104021579 A CN104021579 A CN 104021579A
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Abstract
The invention discloses a method for changing colors of an image. The method comprises the steps that program decoding is conducted on an original image based on a color palette format, so that a first color palette and an image index zone are obtained; a second color palette is obtained; according to pixel indexes in the image index zone, colors corresponding to the pixel indexes are found one by one from the second color palette, colors corresponding to pixels are drawn into a window one by one, and the image is obtained after color changing is conducted. The invention further discloses a device for changing the colors of the image. According to the method and device for changing the colors of the image, consumption of an internal storage and a CPU can be reduced in the color changing process of the image and image resource display can be achieved in games with extremely-high efficiency requirements.
Description
Technical Field
The invention relates to the technical field of computers, in particular to a method and a device for changing color of a picture.
Background
In the field of games, color change is often required to be performed on picture resources, so that the aims of flexibly multiplexing pictures and performing different displays are fulfilled. For color change of picture resources, in the prior art, all pixels of the whole picture are converted one by one according to a certain color change algorithm. The method specifically comprises the following steps:
a picture in a palette-based picture format, after being decoded by a program, may be divided into two parts, namely a palette (a set of colors used by the picture) and a picture index area (a set of index values of each pixel color in the picture in the palette).
Assuming that the width of a picture is W pixels and the height is H pixels, the color value of each pixel occupies PIXSIZE bytes; then a block of memory of size W x H PIXSIZE is allocated to the picture.
And then, according to the pixel indexes in the picture index area of the picture, finding out the colors corresponding to the pixel indexes from the palette one by one, and writing the color values of each pixel into the memory area one by one.
And then, performing color change conversion on each color value of the memory area according to the color change conversion function.
When the picture needs to be drawn, the color values in the memory area are directly drawn to the window pixel by pixel, and the color-changing picture can be seen on the window.
Therefore, the existing color changing method needs to store a new picture in the memory and draw the new picture when the new picture needs to be used. When the color-changing conversion function is complex or the original picture resource is large, the calculation and memory consumption of the method become quite large, so that the method is not suitable for being displayed in games with extremely high efficiency requirements.
Disclosure of Invention
The embodiment of the invention provides a picture color changing method and device, which can reduce the consumption of a memory and a CPU (central processing unit) when a picture is changed in color and can realize picture resource display in a game with extremely high efficiency requirement.
The embodiment of the invention provides a picture color changing method, which comprises the following steps:
performing program decoding on an original picture based on a palette format to obtain a first palette and a picture index area;
acquiring a second palette;
and finding out the colors corresponding to the pixel indexes from the second palette one by one according to the pixel indexes in the picture index area, and drawing the colors corresponding to each pixel into a window one by one to obtain a color-changed picture.
In an embodiment, the obtaining the second palette specifically includes:
copying each color value in the first palette to a memory area;
obtaining a color change parameter;
and performing color change conversion on each color value in the memory area according to the color change parameters and the color change conversion function to obtain a second color palette.
Further, the obtaining of the color-changing parameter specifically comprises: acquiring the color change parameters by importing a pre-configured external file; or, the color-changing parameter is obtained by directly reading a pre-configured internal file; or, a parameter is adjusted in real time according to time to obtain the color change parameter.
Still further, the color change transfer function is a function that adjusts hue, saturation, and intensity; alternatively, the color change transfer function is a function that adjusts contrast; alternatively, the color change conversion function is a function of spatially converting three colors of RGB.
In another embodiment, the obtaining the second palette specifically includes:
selecting a second palette from a pre-stored palette file;
and copying the second palette to a memory area.
The embodiment of the invention also provides a picture color changing device, which comprises:
the decoding module is used for carrying out program decoding on an original picture based on the palette format to obtain a first palette and a picture index area;
the color changing module is used for acquiring a second color palette; and,
and the drawing module is used for finding out the colors corresponding to the pixel indexes from the second color palette one by one according to the pixel indexes in the picture index area, and drawing the colors corresponding to each pixel into a window one by one to obtain the color-changed picture.
In one embodiment, the color changing module specifically includes:
the data copying unit is used for copying each color value in the first palette to a memory area;
the parameter acquisition unit is used for acquiring color change parameters; and,
and the conversion unit is used for performing color change conversion on each color value in the memory area according to the color change parameters and the color change conversion function to obtain a second color palette.
Further, the parameter obtaining unit is specifically configured to obtain the color change parameter by importing a pre-configured external file; or, the color-changing parameter is obtained by directly reading a pre-configured internal file; or, a parameter is adjusted in real time according to time to obtain the color change parameter.
Still further, the color change transfer function is a function that adjusts hue, saturation, and intensity; alternatively, the color change transfer function is a function that adjusts contrast; alternatively, the color change conversion function is a function of spatially converting three colors of RGB.
In another embodiment, the color changing module specifically includes:
the palette selecting unit is used for selecting a second palette from the pre-stored palette file; and,
and the palette copying unit is used for copying the second palette to the memory area.
The embodiment of the invention has the following beneficial effects:
according to the picture color changing method and device provided by the embodiment of the invention, the color changing conversion is carried out on the palette of the picture according to the color changing parameter and the color changing conversion function to obtain a new palette, and the palette used by the picture data is replaced by the new palette. When the picture is drawn, the color corresponding to each pixel index in the picture is found out one by one from the new color palette and drawn into the window, and the color-changed picture can be obtained. Compared with the prior art that a memory is required to be allocated to store new picture resources when picture color changing is carried out, and color changing calculation is required to be carried out on each pixel in the picture one by one, the embodiment of the invention does not need to allocate the memory to store the new picture resources when the picture color changing is carried out, and only needs to carry out color changing on the color changing plate, the picture resources can carry out color changing automatically, so that the consumption of the memory and a CPU (central processing unit) is reduced, and the picture resource display can be realized in a game with extremely high efficiency requirement. In addition, the color-changing parameters can be stored as external files and are imported when the color-changing parameters are needed, so that the consumption of a memory and a CPU can be further reduced.
Drawings
FIG. 1 is a schematic flow chart diagram illustrating an exemplary method for changing color of a picture;
FIG. 2 is a diagram illustrating an embodiment of a picture index area of a picture resource provided by the present invention;
fig. 3 is a schematic flowchart of an embodiment of obtaining a second palette in the method for changing color of a picture according to the present invention;
fig. 4 is a schematic flowchart illustrating another embodiment of obtaining a second palette in the method for changing color of a picture according to the present invention;
FIG. 5 is a schematic structural diagram of an embodiment of a photo chromic device provided in the present invention;
FIG. 6 is a schematic structural diagram of a color changing module of the image color changing apparatus according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of another embodiment of a color changing module of a picture color changing apparatus provided by the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic flow chart of an embodiment of a method for changing color of a picture provided by the present invention.
The embodiment of the invention provides a picture color changing method, which comprises the following steps S1 to S3:
step S1: and carrying out program decoding on the original picture based on the palette format to obtain a first palette and a picture index area.
The picture in the picture format based on the palette can be divided into two parts, namely a first palette and a picture index area after being decoded by a program. Wherein the first palette is a set of colors used by the picture, for example, the first palette comprises 256 colors. The picture index region is a set of index values of each pixel color in the picture in the palette. Fig. 2 is a schematic diagram of an embodiment of a picture index area of a picture resource provided in the present invention, where the picture index area is represented by 16 bytes, and each byte refers to a color using a corresponding sequence number in a color palette.
Step S2: and acquiring a second palette.
As shown in fig. 3, in an embodiment, the method for acquiring the second palette in step S2 specifically includes steps S21 to S23, as follows:
step S21: copying each color value in the first palette to a memory area.
Step S22: and obtaining a color change parameter.
Wherein, the color changing parameter can be stored as an external file. Then, the method for obtaining the color-changing parameter specifically comprises the following steps: and acquiring the color change parameters by importing a pre-configured external file. In the embodiment, the color-changing parameters are stored as external files and are imported when the color-changing parameters are needed, so that the consumption of the memory and the CPU can be reduced.
Alternatively, the color change parameters may be stored as an internal file. Then, the method for obtaining the color-changing parameter specifically comprises the following steps: and acquiring the color change parameters by directly reading a pre-configured internal file.
Alternatively, the color change parameter may be obtained by instant recall. Then, the method for obtaining the color-changing parameter specifically comprises the following steps: and adjusting one parameter in real time according to time to obtain the color change parameter. For example, the gradual process of displaying a picture from color to gray is a process of gradually adjusting a color-changing parameter according to time.
Step S23: and performing color change conversion on each color value in the memory area according to the color change parameters and the color change conversion function to obtain a second color palette. And each color value in the second palette is also stored in the memory area to replace the color value before color change in the memory area.
In particular implementations, the color change transfer function may be a function that adjusts Hue (Hue), Saturation (Saturation), and Intensity (Intensity). Alternatively, the color change transfer function is a function that adjusts contrast. Alternatively, the color-change conversion function is a function of spatially converting three colors of RGB (red, green, and blue). Of course, the color change transfer function may also be other color change functions.
As shown in fig. 4, in another embodiment, the method for obtaining the second palette in step S2 specifically includes steps S31 to S32, as follows:
step S31: a second palette is selected from a palette file stored in advance.
Step S32: and copying the second palette to a memory area.
For example, after a more advanced and complicated color change process is performed on a color change plate picture by means of an external tool (such as Photoshop), one or more new color palettes are obtained and stored as a file, and when the color change is performed on the picture, the new color palettes are copied into a memory area, so that the color palettes used by the picture data are replaced by the new color palettes.
Step S3: and finding out the colors corresponding to the pixel indexes from the second palette one by one according to the pixel indexes in the picture index area, and drawing the colors corresponding to each pixel into a window one by one to obtain a color-changed picture.
In this embodiment, after obtaining the second palette, the palette used by the picture data is replaced with the second palette. When the picture is drawn, the color corresponding to each pixel index in the picture is found out one by one from the second palette, and the picture is drawn into the window, so that the color-changed picture can be obtained and displayed to a user.
According to the picture color changing method provided by the embodiment of the invention, the color of the picture resource can be automatically changed only by replacing the color palette used by the picture data, so that the consumption of a memory and a CPU (central processing unit) can be reduced, and the picture resource display can be realized in a game with extremely high efficiency requirement.
To better illustrate the beneficial effects of the embodiments of the present invention, the memory and CPU consumption of the picture color change are analyzed below.
Suppose the width of the picture is W pixels, the height is H pixels, and the total number of pixels is W x H. The memory consumption representing one color is N and the CPU consumption for performing one color change is F. And assume that the palette of the picture contains P number of colors.
In the prior art, when the color of the picture is changed, the memory is required to be allocated to store new picture resources, and therefore, the memory consumption is (W × H) × N. Moreover, since color change calculation needs to be performed on each pixel in the picture one by one, CPU consumption is: (W × H) × F.
When the method is adopted for changing the color of the picture, as the memory is only required to be allocated to each color in the palette, the memory consumption is as follows: p x N. Moreover, since only the color change calculation needs to be performed on the colors in the palette, the CPU consumption is: p is F.
Since there is a possibility of using the same color pixel in the picture, it is clear that P.ltoreq.WH, and therefore P.ltoreq.NxH, P.ltoreq.WH F. Therefore, compared with the prior art, the technical scheme of the invention can effectively reduce the memory consumption and the CPU consumption. Also in game practice, the palette contains a number of colors P of typically 256, much smaller than W x H of the picture, so the optimization effect is self evident.
In summary, in the color changing method for a picture provided in the embodiments of the present invention, the color changing conversion is performed on the color palette of the picture according to the color changing parameter and the color changing conversion function, so as to obtain a new color palette, and the color palette used by the picture data is replaced with the new color palette. When the picture is drawn, the color corresponding to each pixel index in the picture is found out one by one from the new color palette and drawn into the window, and the color-changed picture can be obtained. Compared with the prior art that a memory is required to be allocated to store new picture resources when picture color changing is carried out, and color changing calculation is required to be carried out on each pixel in the picture one by one, the embodiment of the invention does not need to allocate the memory to store the new picture resources when the picture color changing is carried out, and only needs to carry out color changing on the color changing plate, the picture resources can carry out color changing automatically, so that the consumption of the memory and a CPU (central processing unit) is reduced, and the picture resource display can be realized in a game with extremely high efficiency requirement. In addition, the color-changing parameters can be stored as external files and are imported when the color-changing parameters are needed, so that the consumption of a memory and a CPU can be further reduced.
The embodiment of the invention also provides a picture color changing device which can implement all the processes of the picture color changing method.
Fig. 5 is a schematic structural diagram of an embodiment of the picture color-changing device provided by the present invention.
The embodiment of the invention provides a picture color changing device, which comprises:
a decoding module 101, configured to perform program decoding on an original picture based on a palette format to obtain a first palette and a picture index area;
a color changing module 102, configured to obtain a second color palette; and,
and the drawing module 103 is configured to find colors corresponding to the pixel indexes one by one from the second color palette according to the pixel indexes in the picture index area, and draw the colors corresponding to each pixel one by one into the window to obtain a color-changed picture.
Fig. 6 is a schematic structural diagram of a color changing module of the image color changing apparatus according to an embodiment of the present invention. An embodiment of the present invention provides a color changing module, including:
a data copying unit 201, configured to copy each color value in the first palette to a memory area;
a parameter obtaining unit 202, configured to obtain a color change parameter; and,
and the conversion unit 203 performs color change conversion on each color value in the memory area according to the color change parameter and the color change conversion function to obtain a second palette.
In a specific implementation, the parameter obtaining unit 202 obtains the color change parameter by importing a pre-configured external file; or, the color-changing parameter is obtained by directly reading a pre-configured internal file; or, a parameter is adjusted in real time according to time to obtain the color change parameter.
The color change conversion function used in the present embodiment may be a function for adjusting Hue (Hue), Saturation (Saturation), and Intensity (Intensity). Alternatively, the color change transfer function is a function that adjusts contrast. Alternatively, the color-change conversion function is a function of spatially converting three colors of RGB (red, green, and blue). Of course, the color change transfer function may also be other color change functions.
Fig. 7 is a schematic structural diagram of another embodiment of a color changing module of the picture color changing apparatus according to the present invention. An embodiment of the present invention provides another color changing module, including:
a palette selecting unit 301, configured to select a second palette from a palette file stored in advance; and,
a palette copying unit 302, configured to copy the second palette into a memory area.
According to the picture color changing device provided by the embodiment of the invention, the color changing conversion is carried out on the palette of the picture according to the color changing parameter and the color changing conversion function to obtain a new palette, and the palette used by the picture data is replaced by the new palette. When the picture is drawn, the color corresponding to each pixel index in the picture is found out one by one from the new color palette and drawn into the window, and the color-changed picture can be obtained. Compared with the prior art that a memory is required to be allocated to store new picture resources when picture color changing is carried out, and color changing calculation is required to be carried out on each pixel in the picture one by one, the embodiment of the invention does not need to allocate the memory to store the new picture resources when the picture color changing is carried out, and only needs to carry out color changing on the color changing plate, the picture resources can carry out color changing automatically, so that the consumption of the memory and a CPU (central processing unit) is reduced, and the picture resource display can be realized in a game with extremely high efficiency requirement. In addition, the color-changing parameters can be stored as external files and are imported when the color-changing parameters are needed, so that the consumption of a memory and a CPU can be further reduced.
Through the above description of the embodiments, those skilled in the art will clearly understand that the present invention may be implemented by software plus a necessary hardware platform, and may also be implemented by hardware entirely. With this understanding in mind, all or part of the technical solutions of the present invention that contribute to the background can be embodied in the form of a software product, which can be stored in a storage medium, such as a ROM/RAM, a magnetic disk, an optical disk, etc., and includes instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods according to the embodiments or some parts of the embodiments of the present invention.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (10)
1. A method for changing color of a picture, comprising:
performing program decoding on an original picture based on a palette format to obtain a first palette and a picture index area;
acquiring a second palette;
and finding out the colors corresponding to the pixel indexes from the second palette one by one according to the pixel indexes in the picture index area, and drawing the colors corresponding to each pixel into a window one by one to obtain a color-changed picture.
2. The method for changing color of a picture according to claim 1, wherein said obtaining a second color palette is specifically:
copying each color value in the first palette to a memory area;
obtaining a color change parameter;
and performing color change conversion on each color value in the memory area according to the color change parameters and the color change conversion function to obtain a second color palette.
3. The method for changing color of an image according to claim 2, wherein the obtaining of the color change parameter specifically comprises:
acquiring the color change parameters by importing a pre-configured external file; or,
obtaining the color change parameters by directly reading a pre-configured internal file; or,
and adjusting one parameter in real time according to time to obtain the color change parameter.
4. A method of changing color of pictures according to claim 2 or 3, characterized in that said color change conversion function is a function of adjusting hue, saturation and intensity; alternatively, the color change transfer function is a function that adjusts contrast; alternatively, the color change conversion function is a function of spatially converting three colors of RGB.
5. The method for changing color of a picture according to claim 1, wherein said obtaining a second color palette is specifically:
selecting a second palette from a pre-stored palette file;
and copying the second palette to a memory area.
6. A picture color changing device, comprising:
the decoding module is used for carrying out program decoding on an original picture based on the palette format to obtain a first palette and a picture index area;
the color changing module is used for acquiring a second color palette; and,
and the drawing module is used for finding out the colors corresponding to the pixel indexes from the second color palette one by one according to the pixel indexes in the picture index area, and drawing the colors corresponding to each pixel into a window one by one to obtain the color-changed picture.
7. The device of claim 6, wherein the color changing module specifically comprises:
the data copying unit is used for copying each color value in the first palette to a memory area;
the parameter acquisition unit is used for acquiring color change parameters; and,
and the conversion unit is used for performing color change conversion on each color value in the memory area according to the color change parameters and the color change conversion function to obtain a second color palette.
8. The device according to claim 7, wherein the parameter acquiring unit is specifically configured to acquire the color change parameter by importing a pre-configured external file; or,
obtaining the color change parameters by directly reading a pre-configured internal file; or,
and adjusting one parameter in real time according to time to obtain the color change parameter.
9. The picture color changing apparatus according to claim 7 or 8, wherein the color changing conversion function is a function of adjusting hue, saturation, and intensity; alternatively, the color change transfer function is a function that adjusts contrast; alternatively, the color change conversion function is a function of spatially converting three colors of RGB.
10. The device for changing color of pictures according to claim 6, wherein the parameter acquiring unit specifically comprises:
the palette selecting unit is used for selecting a second palette from the pre-stored palette file; and,
and the palette copying unit is used for copying the second palette to the memory area.
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Application publication date: 20140903 |
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| RJ01 | Rejection of invention patent application after publication |