Bug 491615

Summary:	BMPs in RGBA 5551 format load as translucent
Product:	[Applications] krita	Reporter:	behreandtjeremy
Component:	File formats	Assignee:	Krita Bugs <krita-bugs-null>
Status:	CONFIRMED ---
Severity:	normal	CC:	dimula73, halla
Priority:	NOR
Version First Reported In:	5.2.3
Target Milestone:	---
Platform:	Microsoft Windows
OS:	Microsoft Windows
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:
Attachments:	RGBA16 bmp file

Description behreandtjeremy 2024-08-12 11:27:45 UTC

Created attachment 172537 [details]
RGBA16 bmp file

Krita Version 5.2.3
Windows 10

BMP files in the format RGBA 5551 load as translucent. Expected outcome is that 1-bit alpha is either transparent or opaque.

Forum post: https://krita-artists.org/t/bmp-in-rgba5551-format-opens-as-translucent/98856 .

Comment 1 Halla Rempt 2024-08-12 11:31:32 UTC

We don't have our own code for loading bmp images, we use Qt's qimageio plugin for that, so we can't actually implement this unless we'd write a plugin from scratch. Right now we don't have plans for that.

Comment 2 Dmitry Kazakov 2024-10-22 09:07:25 UTC

Hi, Jeremy!

Where is this file format actually used? Could you tell the usecases? 

PS:

Given that we don't have any code that loads this file format, I would propose to move this bug upstream to Qt, unless there is a popular and important usecase for Krita users.