Legacy ImageMagick Discussions Archive

Those RGBA bmp's are generated by my own program so I know the pixel is 32-bit instead of 24-bit. It looks like most Windows software tools just ignore the alpha channel and treat the bitmap as RGB. To me, if the A channel data is there, it is probably better not to ignore it. And for the case of IM ...

Thanks for your reply snibgo. I've put sample input and output files here: https://www.dropbox.com/sh/ry8xhwey5rmuf2a/AADzOJ7yaJpZW1zqL53sNvrSa?dl=0 Platform: Windows. I'm using the executables from ImageMagick-7.0.3-2-portable-Q16-x86.zip. Input files: 1.bmp and 2.bmp, Both RGBA 1 has a little mark ...

Sorry for digging up an old thread. I've been trying to concatenate a few RGBA bitmaps with alpha channel that could possibly be blank. I find that Magick would smartly convert those blanks ones into opaque (even if I force PNG32:out.png) white images, which is not what I wanted. And, no matter how ...