jp2 files and faststone

[MichelNieuw]

Is there an existing issue for this?

• I checked and did not find my issue in the already reported ones

Describe the bug

When I export a file as JP2000 JP2 file, faststone seems to read it but the picture is far too bright. I have no possibility to find if it is a problem from darktable or from faststone

Steps to reproduce

open a ARW file (in my case)
do processing
save as JP2 file
open this file in faststone

Expected behavior

export correctly

Logfile | Screenshot | Screencast

No response

Commit

No response

Where did you obtain darktable from?

darktable.org / GitHub release

darktable version

5.0.0

What OS are you using?

Windows

What is the version of your OS?

Windows 11

Describe your system

No response

Are you using OpenCL GPU in darktable?

I dont know

If yes, what is the GPU card and driver?

No response

Please provide additional context if applicable. You can attach files too, but might need to rename to .txt or .zip

No response

[victoryforce]

Describe the bug

When I export a file as JP2000 JP2 file, faststone seems to read it but the picture is far too bright. I have no possibility to find if it is a problem from darktable or from faststone

You can import the exported file into darktable, this will show you whether there is a problem with faststone or not.

Steps to reproduce

open a ARW file (in my case) do processing save as JP2 file open this file in faststone

It's not reproducible here. It's likely that this effect was caused by some specific processing, such as the effect of some processing module. So, in order for us to understand what is the matter, we need an image on which you observe the described behavior and the corresponding xmp sidecar file.

[MichelNieuw]

Hi Victor, I imported a jp2 picture from the internet (sample1.jp2). Viewing it in darktable is Ok, viewing it in faststone is Ok. Saving this picture (without any processing) to sample1DT.jp2 (settings: see settings.jpg) and opening it in faststone: wrong brightness. Far too bright. Importing this picture again in Darktable: wrong brightness as well. So since Faststone AND Darktable see the jp2 picture as saved by Darktable wrongly, the error MUST be in Darktable Since your mail server has set the max mail size very low, I cannot send you the complete output file from Darktable. So I cropped it a little (sample1DT_cropped.jp2) Kind regards M Nieuwenhuizen Victor Forsiuk schreef op 2025-02-11 14:40:

> DESCRIBE THE BUG > > When I export a file as JP2000 JP2 file, faststone seems to read it > but the picture is far too bright. I have no possibility to find if it > is a problem from darktable or from faststone You can import the exported file into darktable, this will show you whether there is a problem with faststone or not. > STEPS TO REPRODUCE > > open a ARW file (in my case) do processing save as JP2 file open this > file in faststone It's not reproducible here. It's likely that this effect was caused by some specific processing, such as the effect of some processing module. So, in order for us to understand what is the matter, we need an image on which you observe the described behavior and the corresponding xmp sidecar file. -- Reply to this email directly, view it on GitHub [1], or unsubscribe [2]. You are receiving this because you authored the thread.Message ID: ***@***.***>

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[victoryforce]

I cannot send you the complete output file from Darktable. So I cropped it a little (sample1DT_cropped.jp2)

You didn't actually send anything. You probably weren't aware, but GitHub doesn't support receiving attachments via email replies to comments. So please provide the required images via the web interface.