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[GH-ISSUE #305] Custom theme in .cast file is not used. #820

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opened 2026-03-15 10:36:28 +03:00 by kerem · 11 comments

kerem commented

2026-03-15 10:36:28 +03:00

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Originally created by @zefei on GitHub (May 21, 2018).
Original GitHub issue: https://github.com/asciinema/asciinema/issues/305

Hi, thank you for the wonderful tool that asciinema is!

I wanted to use some custom terminal color theme, and followed the v2 doc, manually added a "theme" attribute in my .cast file. But once the file is uploaded to asciinema.org, the player doesn't seem to use the color values. The file is uploaded to https://asciinema.org/a/y3oFQ2Tf5o61oLwPX4iEqI8CD and it should use a black on white theme.

Thank you!

Originally created by @zefei on GitHub (May 21, 2018). Original GitHub issue: https://github.com/asciinema/asciinema/issues/305 Hi, thank you for the wonderful tool that asciinema is! I wanted to use some custom terminal color theme, and followed the v2 doc, manually added a "theme" attribute in my .cast file. But once the file is uploaded to asciinema.org, the player doesn't seem to use the color values. The file is uploaded to https://asciinema.org/a/y3oFQ2Tf5o61oLwPX4iEqI8CD and it should use a black on white theme. Thank you!

kerem closed this issue

2026-03-15 10:36:33 +03:00

kerem commented

2026-03-15 10:36:39 +03:00

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@ku1ik commented on GitHub (Jun 7, 2018):

That's correct. asciicast v2 spec reserved a place for custom theme, but the web player doesn't support it yet.

When I finish work on SVG thumbnails I'll take a look at this (custom color themes should be honored by both the player and SVG).

@ku1ik commented on GitHub (Jun 7, 2018): That's correct. asciicast v2 spec reserved a place for custom theme, but the web player doesn't support it yet. When I finish work on [SVG thumbnails](https://github.com/asciinema/asciinema-server/pull/304) I'll take a look at this (custom color themes should be honored by both the player and SVG).

kerem commented

2026-03-15 10:36:44 +03:00

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@zefei commented on GitHub (Jun 8, 2018):

Thank you for the explanation and this wonderful tool!

@zefei commented on GitHub (Jun 8, 2018): Thank you for the explanation and this wonderful tool!

kerem commented

2026-03-15 10:36:49 +03:00

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@jakwings commented on GitHub (Dec 5, 2021):

voting for this feature @sickill

@jakwings commented on GitHub (Dec 5, 2021): voting for this feature @sickill

kerem commented

2026-03-15 10:36:54 +03:00

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@uncenter commented on GitHub (May 24, 2025):

Can this be reopened since it isn't actually solved/completed?

@uncenter commented on GitHub (May 24, 2025): Can this be reopened since it isn't actually solved/completed?

kerem commented

2026-03-15 10:37:00 +03:00

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@bonswouar commented on GitHub (Sep 12, 2025):

I don't usually +1, but as I don't want to create a new issue, please reopen this one!

@bonswouar commented on GitHub (Sep 12, 2025): I don't usually +1, but as I don't want to create a new issue, please reopen this one!

kerem commented

2026-03-15 10:37:05 +03:00

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@ku1ik commented on GitHub (Sep 12, 2025):

The player uses the saved theme since v3.7.0 (Feb 2024).

@ku1ik commented on GitHub (Sep 12, 2025): The player uses the saved theme since v3.7.0 (Feb 2024).

kerem commented

2026-03-15 10:37:10 +03:00

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@bonswouar commented on GitHub (Sep 12, 2025):

Does it? It seems to not work for me, at least the main background stays black, causing some glitches, for example: https://asciinema.org/a/zIoij3HHAqUNPR14y74Hhq6JI
fyi I inserted the theme from https://github.com/catppuccin/asciinema/blob/main/themes/macchiato.json

@bonswouar commented on GitHub (Sep 12, 2025): Does it? It seems to not work for me, at least the main background stays black, causing some glitches, for example: https://asciinema.org/a/zIoij3HHAqUNPR14y74Hhq6JI fyi I inserted the theme from https://github.com/catppuccin/asciinema/blob/main/themes/macchiato.json

kerem commented

2026-03-15 10:37:15 +03:00

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@ku1ik commented on GitHub (Sep 29, 2025):

Looks good to me:

Does it look different for you?

@ku1ik commented on GitHub (Sep 29, 2025): Looks good to me: <img width="1262" height="712" alt="Image" src="https://github.com/user-attachments/assets/5b942df8-44b0-4db0-b773-fa4a2e196bbb" /> Does it look different for you?

kerem commented

2026-03-15 10:37:20 +03:00

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@bonswouar commented on GitHub (Sep 29, 2025):

After digging a bit it seems there are only two tiny issues:

The colors were originally a bit wrong for me, but I've found out it was because of Darkreader extension. A global dark theme toggle for the website could fix that maybe (detected as dark theme by the extension, so that it won't try to override it)
The background shouldn't be almost black (it's #121314 instead of #24273a). I've just checked the cast file and there is "bg": "#24273a", not sure why it isn't applied?

@bonswouar commented on GitHub (Sep 29, 2025): After digging a bit it seems there are only two tiny issues: - The colors were originally a bit wrong for me, but I've found out it was because of Darkreader extension. A global dark theme toggle for the website could fix that maybe (detected as dark theme by the extension, so that it won't try to override it) - The background shouldn't be almost black (it's `#121314` instead of `#24273a`). I've just checked the cast file and there is `"bg": "#24273a"`, not sure why it isn't applied?

kerem commented

2026-03-15 10:37:25 +03:00

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@ku1ik commented on GitHub (Sep 29, 2025):

@bonswouar you have a typo in your cast file - the color palette should be under key palette while your file has pallete. This caused the whole theme to be ignored, resulting in default ("asciinema") theme being used.

@ku1ik commented on GitHub (Sep 29, 2025): @bonswouar you have a typo in your cast file - the color palette should be under key `palette` while your file has `pallete`. This caused the whole theme to be ignored, resulting in default ("asciinema") theme being used.

kerem commented

2026-03-15 10:37:30 +03:00

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@bonswouar commented on GitHub (Sep 29, 2025):

My bad, I totally didn't notice this typo! 😅
I've just pushed a PR to fix it in catppuccin repo, thanks for your help debugging this :)

@bonswouar commented on GitHub (Sep 29, 2025): My bad, I totally didn't notice this typo! 😅 I've just pushed a PR to fix it in catppuccin repo, thanks for your help debugging this :)