Apache OpenOffice (AOO) Bugzilla – Issue 69779
Faster preview of JPEGs by using their EXIF or JFIF thumbnails
Last modified: 2017-05-20 11:31:07 UTC
Followup to issue 55170 and the image preview infrastructure from the CWS pngperf: JPEGs from cameras and other sources of high resolution images often contain thumbnails of the full image. If the required preview size is smaller or equal to the size of the thumbnail available in the JPEG then using the thumbnail instead of the full image can speed up the image processing considerable. Even when the full image was saved in progressive mode (see issue 67237) the thumbnail is much cheaper. JPEG thumbnails are available in either the EXIF table or the JFIF table.
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