TGA corner pixels have Red and Blue channels swapped after export

[Lorthiz]

TLDR: When exporting to TGA(Targa) format UpperRight and LowerRight corners have their Red and Blue channels swapped.

 

Steps to reproduce:

1) Create any document.

2) Place in UpperRight or LowerRight corner object with color that has different Red and Blue channels. eg. R:125 G:00 B:00

3) Export image as TGA(Targa)

4) Load exported TGA image to AffinityDesigner.

 

Actual result:

One pixel in both right corners has Red and Blue components swapped. If we saved this color in one of corners: (R:125 G:00 B:00) the loaded pixel in that corner will be: (R:00 G:00 B:125)

Expected result: components are not swapped during export. Especialy useful if you are writing TGA loaders/converters and you are expecting that data you are loading is correct...

 

Additional info:

I have not experienced any problems with Green or Alpha chanel so it seems to be affecting only Red and Blue.'

Export size seems to not have affect it's always one pixel from both corners.

It's not loading problem. After checking TGA files with Hex editors and checking values stored inside the incorrect values are saved during export.

 

Files to reproduce and screenshots are attatched:

2 .afdesign files with sources that can be used to export check source files.

3 Exported TGA images where inproper behaviour can be spotted

3 Screenshots from symetric gradient presenting incorrect data after export.

4x4.tga

TGABug.afdesign

4x4GreenEdition.tga

TGAGradientBug.afdesign

TGAGradientBugBig.tga

[Sean P]

Hi Lorthiz,

Thanks for letting us know. I've reproduced this here and I believe there is a fault in both saving and loading the TGA. For example opening a TGA saved in Photoshop will display 1 inverted pixel as well! I will get it passed on to development.

[Lorthiz]

@Sean P Hello, do you know what is the state of this issue?

I can see my post has an issue number label pinned to it but I don't have access to your internal issue tracker so I can't check it myself  

[Affinity Info Bot]

The issue "TGA Export and Import is inverting a single pixel value." (REF: AF-478) has been fixed by the developers in internal build "2.4.0.2222".
This fix should soon be available as a customer beta and is planned for inclusion in the next customer release.
Customer beta builds are announced here and you can participate by following these instructions.
If you still experience this problem once you are using that build version (or later) please reply to this thread including @Serif Info Bot to notify us.