BMP in RGBA5551 format opens as translucent

Support and Advice General Questions
1

Hi all,

I’m posting this as a preliminary to see if this is a bug with Krita’s bmp import or with the export that generated the bmp. An RGBA5551 format bmp opens as translucent in Krita. I’m using Krita version 5.2.3 on Windows 10.

Below is a screen capture from Krita.

kritaScreenCap
kritaScreenCap1366×738 26.6 KB

For comparison is a screen capture from GIMP.

gimpScreenCap
gimpScreenCap1366×738 53.1 KB

There are issues with other alpha in other image viewers, such as Irfanview and XnView MP, but the more common issue is that they ignore alpha completely and render clear black as opaque.

This is a hex dump of the file.

Row 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F
00000000 42 4D 9A 00 00 00 00 00 00 00 7A 00 00 00 6C 00
00000010 00 00 08 00 00 00 02 00 00 00 01 00 10 00 03 00
00000020 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00000030 00 00 00 00 00 00 00 7C 00 00 E0 03 00 00 1F 00
00000040 00 00 00 80 00 00 42 47 52 73 00 00 00 00 00 00
00000050 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00000060 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00000070 00 00 00 00 00 00 00 00 00 00 0C 8E 74 89 B2 9C
00000080 30 B4 0A D4 00 00 00 00 00 00 00 00 00 FC A0 FD
00000090 80 FE 20 FF E0 FF 43 C3 A6 82

Thanks for your time,
Jeremy

2

Given that it has 1 bit for alpha, it shouldn’t be possible for it to be semi-transparent, and the file data looks fine as far as I can tell. But Krita doesn’t handle BMP itself, I’m pretty sure it uses Qt for that, so I’d guess it’s a Qt bug?

3

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