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[GH-ISSUE #426] [Bug] APNG image output #1719

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opened 2026-03-01 18:47:44 +03:00 by kerem · 13 comments
kerem commented 2026-03-01 18:47:44 +03:00
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Originally created by @vatterspun on GitHub (Jan 8, 2019).
Original GitHub issue: https://github.com/NickeManarin/ScreenToGif/issues/426

Background: Trying to create a simple image slideshow for a freeware notepad program.

Setup: Win7x86, STG 2.15.1 (portable)

Steps:

  1. Add some static images from file
  2. Override frame delay
  3. Save as APNG file

Result: some odd overlapping color issues:

2

Other notes: I tried disabling "detect unchanged pixels" but got the same result. I was able to export to GIF and then use PNGOptimizer to get to the APNG file I was looking for, but obviously with some quality loss.

Originally created by @vatterspun on GitHub (Jan 8, 2019). Original GitHub issue: https://github.com/NickeManarin/ScreenToGif/issues/426 **Background**: Trying to create a simple image slideshow for a freeware notepad program. **Setup**: Win7x86, STG 2.15.1 (portable) **Steps**: 1. Add some static images from file 2. Override frame delay 3. Save as APNG file Result: some odd overlapping color issues: ![2](https://user-images.githubusercontent.com/1289134/50861193-9093c380-135d-11e9-916c-7c4dbf94ea08.png) **Other notes**: I tried disabling "detect unchanged pixels" but got the same result. I was able to export to GIF and then use PNGOptimizer to get to the APNG file I was looking for, but obviously with some quality loss.
kerem 2026-03-01 18:47:44 +03:00
kerem commented 2026-03-01 18:47:45 +03:00
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@NickeManarin commented on GitHub (Jan 8, 2019):

Fixed in https://github.com/NickeManarin/ScreenToGif/releases/tag/2.15.2
Released a few minutes ago. :)

<!-- gh-comment-id:452477728 --> @NickeManarin commented on GitHub (Jan 8, 2019): Fixed in https://github.com/NickeManarin/ScreenToGif/releases/tag/2.15.2 Released a few minutes ago. :)
kerem commented 2026-03-01 18:47:45 +03:00
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@vatterspun commented on GitHub (Jan 9, 2019):

Oh badass! Thanks :)

<!-- gh-comment-id:452784202 --> @vatterspun commented on GitHub (Jan 9, 2019): Oh badass! Thanks :)
kerem commented 2026-03-01 18:47:45 +03:00
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@vatterspun commented on GitHub (Jan 9, 2019):

I retested the latest version 2.15.2 but unfortunately getting similar results with a few screencaps of the Everything search program:

a5

<!-- gh-comment-id:452787147 --> @vatterspun commented on GitHub (Jan 9, 2019): I retested the latest version 2.15.2 but unfortunately getting similar results with a few screencaps of the Everything search program: ![a5](https://user-images.githubusercontent.com/1289134/50917807-23873900-1404-11e9-9625-5d10691d2a15.png)
kerem commented 2026-03-01 18:47:45 +03:00
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@NickeManarin commented on GitHub (Jan 9, 2019):

Hmm, I'm missing something. I just downloaded both files (portable, installer) did a recording, opening menus and everything looks fine.
I had the option to ignore repeated pixels turned on too.

Did you check if you are using v2.15.2? If so, can you share your project? Maybe there's something different with the frames...

<!-- gh-comment-id:452898531 --> @NickeManarin commented on GitHub (Jan 9, 2019): Hmm, I'm missing something. I just downloaded both files (portable, installer) did a recording, opening menus and everything looks fine. I had the option to ignore repeated pixels turned on too. Did you check if you are using v2.15.2? If so, can you share your project? Maybe there's something different with the frames...
kerem commented 2026-03-01 18:47:45 +03:00
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@vatterspun commented on GitHub (Jan 13, 2019):

I realized my initial step listing was incomplete. It's modifying the timing to slideshow speed that seems to create the overlapping issue.

Could you retest by setting the delay override to 2100? As below ...

Setup: Win10x64

Steps:

  1. Grab a bunch of same-size screenshots. Something with some overlapping white space.
  2. Select Load to add the screens to the editor
  3. At the bottom of the screen, select all frames
  4. From the Edit screen click Override and change the delay to 2100
  5. File - Save as APNG

Defect: same as above.

Sorry for the confusion, I didn't think the delay had anything to do with it. Bad bug reporting on my part.

<!-- gh-comment-id:453793778 --> @vatterspun commented on GitHub (Jan 13, 2019): I realized my initial step listing was incomplete. It's modifying the timing to slideshow speed that seems to create the overlapping issue. Could you retest by setting the delay override to 2100? As below ... Setup: Win10x64 Steps: 1. Grab a bunch of same-size screenshots. Something with some overlapping white space. 2. Select **Load** to add the screens to the editor 3. At the bottom of the screen, select all frames 4. From the Edit screen click Override and change the delay to 2100 5. File - Save as APNG Defect: same as above. Sorry for the confusion, I didn't think the delay had anything to do with it. Bad bug reporting on my part.
kerem commented 2026-03-01 18:47:45 +03:00
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@NickeManarin commented on GitHub (Jan 13, 2019):

Like this one?

test

<!-- gh-comment-id:453860678 --> @NickeManarin commented on GitHub (Jan 13, 2019): Like this one? ![test](https://user-images.githubusercontent.com/14798947/51090020-f5378f80-175c-11e9-992f-ed1ae9249f67.png)
kerem commented 2026-03-01 18:47:46 +03:00
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@NickeManarin commented on GitHub (Jan 13, 2019):

How did you create your screenshots? Can you share them? I think that this is related to an unexpected image content.

<!-- gh-comment-id:453860861 --> @NickeManarin commented on GitHub (Jan 13, 2019): How did you create your screenshots? Can you share them? I think that this is related to an unexpected image content.
kerem commented 2026-03-01 18:47:46 +03:00
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@vatterspun commented on GitHub (Jan 13, 2019):

How did you create your screenshots?

I used Greenshot. I'll attach a recording of what I did (created also using STG) to show you all the steps.

Notes on the recording:

  1. After the initial screenshot of the Everything program, I was pressing a key combo of CTRL+SHIFT+L for "capture last region" so it was able to grab the window with the menu items. That didn't show up very clear in the recording.

  2. The last step was moving the recorded PNG file into Firefox. I accidentally deleted a few too many connecting frames in the recording. I realize that wasn't super clear.

Process:
a11

Individual images:
images.zip

<!-- gh-comment-id:453873547 --> @vatterspun commented on GitHub (Jan 13, 2019): > How did you create your screenshots? I used Greenshot. I'll attach a recording of what I did (created also using STG) to show you all the steps. Notes on the recording: 1. After the initial screenshot of the Everything program, I was pressing a key combo of CTRL+SHIFT+L for "capture last region" so it was able to grab the window with the menu items. That didn't show up very clear in the recording. 2. The last step was moving the recorded PNG file into Firefox. I accidentally deleted a few too many connecting frames in the recording. I realize that wasn't super clear. Process: ![a11](https://user-images.githubusercontent.com/1289134/51091704-cff25380-1753-11e9-871a-3625686a8af5.png) Individual images: [images.zip](https://github.com/NickeManarin/ScreenToGif/files/2753651/images.zip)
kerem commented 2026-03-01 18:47:46 +03:00
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@NickeManarin commented on GitHub (Jan 16, 2019):

Thanks for the detailed feedback. :)

I identified the problem and fixed it. It was caused by an unusual pixel format (BGR32).
Now, when loading images, the app will convert them to BGRA32.

Tomorrow I think that I can create a new release of the app.

<!-- gh-comment-id:454601832 --> @NickeManarin commented on GitHub (Jan 16, 2019): Thanks for the detailed feedback. :) I identified the problem and fixed it. It was caused by an unusual pixel format (BGR32). Now, when loading images, the app will convert them to BGRA32. Tomorrow I think that I can create a new release of the app.
kerem commented 2026-03-01 18:47:46 +03:00
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@vatterspun commented on GitHub (Jan 16, 2019):

Thanks for the detailed feedback

Thanks for noticing. Getting that screen recording down to a reasonable size took a really long time. Luckily I had ScreenToGif's editor :)

Tomorrow I think that I can create a new release of the app.

Awesome, I look forward to testing.

<!-- gh-comment-id:454637194 --> @vatterspun commented on GitHub (Jan 16, 2019): > Thanks for the detailed feedback Thanks for noticing. Getting that screen recording down to a reasonable size took a really long time. Luckily I had ScreenToGif's editor :) > Tomorrow I think that I can create a new release of the app. Awesome, I look forward to testing.
kerem commented 2026-03-01 18:47:46 +03:00
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@vatterspun commented on GitHub (Jan 19, 2019):

Retested successfully with and without "detect changed pixels". Thanks!

<!-- gh-comment-id:455819965 --> @vatterspun commented on GitHub (Jan 19, 2019): Retested successfully with and without "detect changed pixels". Thanks!
kerem commented 2026-03-01 18:47:46 +03:00
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@NickeManarin commented on GitHub (Jan 19, 2019):

Thanks :)

<!-- gh-comment-id:455819996 --> @NickeManarin commented on GitHub (Jan 19, 2019): Thanks :)
kerem commented 2026-03-01 18:47:46 +03:00
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@vatterspun commented on GitHub (Feb 15, 2019):

Your program in use for software slideshow animations over on the S2G thread at PFW: https://www.portablefreeware.com/forums/viewtopic.php?p=92617#p92617

<!-- gh-comment-id:464234995 --> @vatterspun commented on GitHub (Feb 15, 2019): Your program in use for software slideshow animations over on the S2G thread at PFW: https://www.portablefreeware.com/forums/viewtopic.php?p=92617#p92617
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