image test set with alpha channel

Pierrick Philippe

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Nov 10, 2023, 5:22:41 AM11/10/23

to Workshop and Challenge on Learned Image Compression (CLIC)

Dear all,

Surprisingly, one image from the test set includes an alpha channel.

(this one is 4cd6910a0b7b39365fda5df87618d091)

Our submission did not anticipate such format and our decoder delivers only RGB png files (i.e. without the alpha channel)

We hope that the server is able to accommodate png formats slightly different from the source during the evaluation. Otherwise I anticipate a few candidate failures.

A potential fix would be to update the source file in RGB instead of the RGBA.

Best regards

Pierrick

Nick Johnston

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Nov 10, 2023, 4:59:11 PM11/10/23

to Pierrick Philippe, Workshop and Challenge on Learned Image Compression (CLIC)

For this image, the evaluation server ignores the alpha channel. Just drop this channel when compressing it and we will work on a patch for the image dataset.

-- Nick Johnston

CLIC Organizer

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Nick Johnston
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Pierrick Philippe

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Nov 11, 2023, 1:12:50 AM11/11/23

to Nick Johnston, Workshop and Challenge on Learned Image Compression (CLIC)

Great, thanks a lot for your answer

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