How to get individual R,G,B values of a pixel?
Blitz3D Forums/Blitz3D Beginners Area/How to get individual R,G,B values of a pixel?
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I was wondering if and how you can get the individual rgb values of a pixel. Red=value, G=Value, B=Value I tried rgb=readpixel(x,y)and $ffffff, but it gives one long number which i don't know what to do with. |
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Nevermind. Found the info in the online manual via the following commands GetColor x,y ColorRed(),ColorGreen(), ColorBlue() Last edited 2011 |
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There is another way which is as follows:rgb=readpixel(x,y) red=(rgb shr 16) and 255 green=(rgb shr 8) and 255 blue=rgb and 255 ;and to convert back from individual components to rgb do the following rgb = (red shl 16) or (green shl 8) or blue |
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Depending on what you use this for, it might be good to know that the return values could differ depending on the bitdepth of the current display mode: In 16-bit display mode, some of the precision is lost when writing onto the screen. That results in values that are slightly off compared to the same program running on a 32-bit display mode. Again, info only applies depending on what you use this for. |