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TIFFTAG_PREDICTOR should not be applied unless LZW, DEFLATE or ADOBE_DEFLATE #21871

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Merged
merged 1 commit into from
May 13, 2022
Merged

TIFFTAG_PREDICTOR should not be applied unless LZW, DEFLATE or ADOBE_DEFLATE #21871

merged 1 commit into from
May 13, 2022

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xiongzhen
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Pull Request Readiness Checklist

See details at https://github.com/opencv/opencv/wiki/How_to_contribute#making-a-good-pull-request

  • I agree to contribute to the project under Apache 2 License.
  • To the best of my knowledge, the proposed patch is not based on a code under GPL or another license that is incompatible with OpenCV
  • The PR is proposed to the proper branch
  • There is a reference to the original bug report and related work
  • There is accuracy test, performance test and test data in opencv_extra repository, if applicable
    Patch to opencv_extra has the same branch name.
  • The feature is well documented and sample code can be built with the project CMake

@asmorkalov
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@xiongzhen Thanks for the patch. Could you describe your use case and why TIFFTAG_PREDICTOR option should be set for LZW case only?

@xiongzhen xiongzhen changed the title TIFFTAG_PREDICTOR should not be applied if not LZW TIFFTAG_PREDICTOR should not be applied unless LZW, DEFLATE or ADOBE_DEFLATE Apr 18, 2022
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xiongzhen commented Apr 18, 2022 •
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@asmorkalov We used to support packbits when saving a TIF image. We are replacing LEADTOOLS with openCV, finding that it fails to save a packbits tif image in that predictor = PREDICTOR_HORIZONTAL is applicable to just several compression methods (otherwise it throws): LZW, DEFLATE and ADOBE_DEFLATE.

https://www.awaresystems.be/imaging/tiff/tifftags/predictor.html
Theoretically, the predictor step is independent from the compression step, and thus can be combined with any compression scheme. It is, however, likely to be most useful when combined with either LZW or Deflate compression.

I suppose it should not opt-in predictor except for the appropriate methods.

Thanks.

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Thanks for details. I dig a bit in documentation and got your point. Could you add couple of test cases for your case (PACKBITS + LZW and something out of condition) like this:

opencv/modules/imgcodecs/test/test_tiff.cpp

Line 331 in 438fe3f

TEST(Imgcodecs_Tiff, readWrite_32FC3_RAW)
. We will be sure that there are no regressions with TIFF update or other code changes.

@asmorkalov asmorkalov added pr: needs test New functionality requires minimal tests set and removed pr: Discussion Required labels Apr 20, 2022
xiongzhen added a commit to xiongzhen/opencv that referenced this pull request Apr 25, 2022
@xiongzhen
testing case for opencv#21871
c363d73
xiongzhen added a commit to xiongzhen/opencv that referenced this pull request Apr 25, 2022
@xiongzhen
testing case for opencv#21871
1bfa17d
@asmorkalov asmorkalov removed the pr: needs test New functionality requires minimal tests set label Apr 25, 2022
asmorkalov
asmorkalov reviewed Apr 26, 2022
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Thanks a lot for the test!

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Thanks a lot! The patch looks good to me! Please squash the commits to merge solid patch.

@xiongzhen xiongzhen closed this Apr 28, 2022
@xiongzhen xiongzhen deleted the apply-predictor-to-lzw-only branch April 28, 2022 02:35
@xiongzhen xiongzhen restored the apply-predictor-to-lzw-only branch April 28, 2022 02:38
@xiongzhen xiongzhen reopened this Apr 28, 2022
@asmorkalov asmorkalov self-requested a review May 13, 2022 06:45
@asmorkalov asmorkalov force-pushed the apply-predictor-to-lzw-only branch from 36cf4b3 to 2238ac7 Compare May 13, 2022 06:46
asmorkalov
asmorkalov approved these changes May 13, 2022
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LGTM

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@xiongzhen Thanks for the contribution. I squashed commits in your branch to have solid OpenCV commit history after merge.

@opencv-pushbot opencv-pushbot merged commit 612d43f into opencv:3.4 May 13, 2022
@opencv-pushbot opencv-pushbot added this to the 3.4.18 milestone May 13, 2022
@opencv-pushbot opencv-pushbot mentioned this pull request May 14, 2022
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@alalek alalek mentioned this pull request Aug 21, 2022
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