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Fix #107212: imb_is_a_ Failures Detecting Valid Images #107661

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Harley Acheson wants to merge 1 commits from Harley:Imb_is_a into main
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Harley Acheson commented 2023-05-05 18:36:15 +02:00
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Changes to some imb_is_a functions to not use imb_oiio_check
which is failing on many images.

For quick detection of valid image files we read just 64 bytes of the file and then check the header for magic numbers, using functions provided by each format's library. However since the change to using OpenImageIO for all image formats we have been calling imb_oiio_check which tries to read the file with get_oiio_reader but this fails on many files. I'm guessing that this oiio function is just not meant for this purpose.

In my test suite of 542 PNG images, the current imb_is_a_png fails on 177 of them. This PR just replaces some imb_is_a tests with direct tests of the file's signature. In the case of PNG just the first 8 bytes that are recognized as the testable signature. https://en.wikipedia.org/wiki/List_of_file_signatures

With this PR all 542 of my test PNG are seen as valid, make thumbnails, and load fine.

Changes to some imb_is_a functions to not use imb_oiio_check which is failing on many images. --- For quick detection of valid image files we read just 64 bytes of the file and then check the header for magic numbers, using functions provided by each format's library. However since the change to using OpenImageIO for all image formats we have been calling `imb_oiio_check` which tries to read the file with `get_oiio_reader` but this fails on many files. I'm guessing that this oiio function is just not meant for this purpose. In my test suite of 542 PNG images, the current `imb_is_a_png` fails on 177 of them. This PR just replaces some imb_is_a tests with direct tests of the file's signature. In the case of PNG just the first 8 bytes that are recognized as the testable signature. https://en.wikipedia.org/wiki/List_of_file_signatures With this PR all 542 of my test PNG are seen as valid, make thumbnails, and load fine.
Harley Acheson added 1 commit 2023-05-05 18:36:24 +02:00
d35dafa4bb IMB: Is_A Failures Detecting Valid Images 
Changes to some imb_is_a functions to not use imb_oiio_check
which is failing on many images.
Harley Acheson requested review from Jesse Yurkovich 2023-05-05 18:37:01 +02:00
Harley Acheson changed title from IMB: Is_A Failures Detecting Valid Images to Fix #107212: imb_is_a_ Failures Detecting Valid Images 2023-05-05 19:53:26 +02:00
Jesse Yurkovich commented 2023-05-05 19:59:13 +02:00
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Already had a PR out #107515. It's slightly different, can you test that one actually?

Already had a PR out #107515. It's slightly different, can you test that one actually?
Harley Acheson commented 2023-05-05 20:03:38 +02:00
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@deadpin - yes, sorry didn't notice that one. Will look at right now.

@deadpin - yes, sorry didn't notice that one. Will look at right now.
Harley Acheson commented 2023-05-05 23:45:21 +02:00
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Closing in favor of #107515

Closing in favor of #107515
Harley Acheson closed this pull request 2023-05-05 23:45:36 +02:00
Harley Acheson deleted branch Imb_is_a 2023-05-05 23:45:52 +02:00

Pull request closed

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