That is often *not* the case but all of OpenCV assumes it. This code should be able to handle `uint8` and `float32` without problems.Īnother "defect": this assumes a linear color space. I chose to work with floats because that makes the numerics slightly simpler. Ask me if any of that Python is unfamiliar to you. *pseudocode* that should be a good guideline for a C++ implementation. Until now, the described functionality required someone to take an explicit subregion, split the channels of the `Mat`s, and calculate the result manually (using whole-array operations). It could do more or less of the described functionality. I think this would be a popular function to have. taking a subregion of a Mat and copying data into it simple fading, which applies the same transparency to every overlying pixel blend modes, which only take into account the color channels of two images (in the basic formulation) drawing of primitives (lines and shapes) with some transparency `cvtColor` with `BGRA2BGR`, which simply drops the fourth channel the `dst` image could be altered or left alone, that's a design decision optionally erase color data that is completely transparent (GIMP doesn't do it.) use the alpha channel of the top and bottom image to blend each pixel accordingly be sensitive to the alpha channel of the *bottom* image, and update it overlay the top image at the given position (the overlay may be completely or partially off-screen) if the destination image is an empty Mat, resize it to overlay size, and generate the stereotypical gray checkerboard background instead take an overlay image that should have an alpha-channel (but need not) The top image is frequently not of the same size as the bottom one, and a particular position is desired. That means it's not just blending two pictures, or fading two pictures with one global alpha value. Motivation: frequently, p … eople (on Stack Overflow and elsewhere) want to overlay one image onto another, with an actual alpha channel. This is a feature request for the `imgproc` module.
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