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Bug 619843 - Saving as 32bit bitmap ignores alpha channel
Saving as 32bit bitmap ignores alpha channel
Status: RESOLVED DUPLICATE of bug 573090
Product: GIMP
Classification: Other
Component: libgimp
2.6.8
Other Linux
: Normal normal
: ---
Assigned To: GIMP Bugs
GIMP Bugs
Depends on:
Blocks:
 
 
Reported: 2010-05-27 15:43 UTC by joshua.j.houghton
Modified: 2010-06-01 07:37 UTC
See Also:
GNOME target: ---
GNOME version: ---


Description joshua.j.houghton 2010-05-27 15:43:22 UTC 
When saving as a 32bit bmp it ignores the alpha channel, after doing a hexdump i found that the alpha component is set to 0xff throughout the image even though some of it was transparent before saving.
Comment 1 Martin Nordholts 2010-05-27 16:31:50 UTC 
Closing as duplicate to 573090 which is regarding the same topic, although it's not a pure duplicate. In short: Please provide a patch.

*** This bug has been marked as a duplicate of bug 573090 ***
Comment 2 Tor Lillqvist 2010-06-01 07:37:46 UTC 
And repeating what I said in bug #573090: 32-bit bmp files with "BI_RGB" compression are underspecified. The "extra" byte of each pixel is interpreted as an alpha channel in some software, but ignored in other software. For portability between applications, you should avoid this format.