![]() Adding the variable _TextureName_TexelSize to your shader will give you the 1/texturedimensions.xy and texturedimensions.xy values. The other thing most people don't realize is Unity passes all the necessary information about texture resolutions to do this with out needing to hard code anything. If this is a palette that's more than 1 pixel high you would want to do the same mid-pixel sampling for y too! Instead you want to sample from a range of "half pixel" to "1 - half pixel" on x. But as you can see above that's going to get you values you don't want. So going back to the original shader code, the thing people usually do to sample a texture is construct a texture UV with a range from "0.0" and "1.0" on the x, and then sample "0.0" for y. Interestingly, if you do this offset, even the bilinear filtered image will get you the values you actually want. What you really want to do, even when using point sampling, is offset your "lookup" UV's by half a pixel so it's sampling from the center, like this. However the UVs of "0.0", "0.25", "0.5" and 0.75" are still on that border between colors, and due to floating point precision it can end up one side or the other in sometimes unpredictable ways. This is probably more how you're thinking about the texture. Notice how the color at "0.0" on the left isn't fully red? Also notice how "0.5" in this case is also half way between the green and blue? Just enabling clamping will remove the blending on the ends, but between the other pixels. This is what that 4x1 texture looks like blown up to 512x128 with bilinear filtering and wrapping set to repeat (the default settings). ![]() Lets look at a 4x1 palette of red, green, blue, and black.Įrm, okay, let's look at that a little bigger. With clamping, point filtering, and no mip maps it'll act a bit more like you expect, but you're still technically sampling on the border between pixel colors so you may get the wrong color sometimes. ![]() A UV value of "1.0" is on the opposite edge, and is the same color! With bilinear (or better) filtering w/o clamped wrapping enabled you're going to get a color that's 50% of the first pixel and 50% of the last pixel. To understand why the current shader may not be working like you expect, a UV value of "0.0" is on the edge of the texture between two pixels. For the different pictures, the settings can be different too, they depend on the colors and size in pixels.Click to expand.Why are you using 3 rows? Why not a 1x256 RGB texture? That'll make this much easier to handle in the shader. For a more accurate selection of colors you can use HEX format. Conversely, if you do not see changes or color is not completely replaced, then you need to increase the "Color replacement intensity", and also make sure that you have select the right colors. The swap texture, with the color at index 25 set to blue. ![]() The number of generated colors can range from a single color to twenty different colors and in addition to displaying the color palette, the tool will also show the. If everything becomes one-color, replaced too much or affects other colors, then you need to reduce the "Color replacement intensity". If we want to swap this color, then in the swap texture we need to set the pixel at index 25 to the color we want the outline to be: blue. The Color Palette From Image is simple to use allows the user to upload an image of their choosing, and then generate a palette of colors that can be found on the uploaded image. To create the above examples, were used the following settings: " Color that should be replaced" – "pink", " Replace the selected color with" – "purple" color (for the next processing "blue", etc.), " Color replacement intensity" – "45". Pink rose without changes and examples of pink color replacement to: purple, blue, turquoise, green and yellow color: Specify the image on your computer or phone, select the colors you want to replace, click OK button at the bottom of this page, wait a few seconds and download the finished result. Replacement of a certain color in the image to the specified color online
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