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 ...
Search found 3 matches
- 2016-10-06T08:10:52-07:00
- Forum: Users
- Topic: Add or preserve alpha channel
- Replies: 13
- Views: 52523
- 2016-10-06T01:58:56-07:00
- Forum: Users
- Topic: Add or preserve alpha channel
- Replies: 13
- Views: 52523
Re: Add or preserve alpha channel
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 ...
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 ...
- 2016-10-05T23:16:34-07:00
- Forum: Users
- Topic: Add or preserve alpha channel
- Replies: 13
- Views: 52523
Re: Add or preserve alpha channel
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 ...
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 ...