![]() ![]() Int defaultTextViewColor = textView.getTextColors(). int rgba_color = Color.parseColor("#8a000000") //textViewColor Here is some java code (works on Android API 24): //int rgb_background = Color.parseColor("#ffffff") //white background If the color is in non pre-multiplied color-space, then you can just discard the alpha channel. If the RGBA is in pre-multiplied color-space and is semi-transparent, you need to divide out alpha to get the correct RGB color. In my case, I wanted to convert an RGBA image to RGB and the following worked just as expected: rgbImage = cv2.cvtColor(npimage, cv2.COLOR_RGBA2RGB) version rgba(0,0,0,0) with matte rgb(ff,ff,ff) will be changed to rgb(0,0,0). This changed version works fine for me, because in prev. Solution provided by Andras Zoltan should be slightly changed to: Source => Target = (BGColor + Source) = To get the final 0-255 values for Target you simply multiply all the normalised values back up by 255, making sure you cap at 255 if any of the combined values exceed 1.0 (this is over-exposure and there are more complex algorithms dealing with this that involve whole-image processing etc.).ĮDIT: In your question you said you want a white background - in that case just fix BGColor to 255,255,255. Target.B = ((1 - Source.A) * BGColor.B) + (Source.A * Source.B) Target.G = ((1 - Source.A) * BGColor.G) + (Source.A * Source.G) Target.R = ((1 - Source.A) * BGColor.R) + (Source.A * Source.R) Now, the conversion is defined as (in complete psuedo code here!): Source => Target = (BGColor + Source) = Use our tool below to seamlessly convert between various color systems including CIELAB, HEX, RGB, CMYK, and XYZ. We'll call the result BGColor Note - if the background colour is also transparent, then you'll have to recurse the process for that first (again, choosing a matte) to get the source RGB for this operation. A 20 lighter version of the original color is 212, 155, 255, and 94, 51, 197 is the 20 darker color. A complement of this color would be 204, 255, 102, and the grayscale version is 134, 134, 134. Normalise also the matte colour (black, white whatever). The RGB color 153, 102, 255 is a light color, and the websafe version is hex 9966FF.convert from CMYK cyan / magenta / yellow / black to RRGGBB. ![]() convert from RGBA red green blue transparency to NCS-number (S0000-X00X) CMYK to HEX.
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