JPEG HDR

[odan]

Jpeg HDR

Is regarded as tomorrow's format, but is not yet very widespread due to its licensing procedure.

• https://www.dolby.com/us/en/technologies/jpeg-hdr.html
• https://en.wikipedia.org/wiki/JPEG_XT#JPEG-HDR
• http://fileformats.archiveteam.org/wiki/JPEG-HDR
• http://www.anyhere.com/gward/papers/cic05.pdf

[peter279k]

I can help this issue.

[peter279k]

@odan, the JPEG-HDR is part of the JPEG.

Please consider following situations:

• The JpegDetector will detect this image format firstly and return the detection result is JPEG. And it will not detect the JPEG-HDR correctly.

I think we have two problems:

• We should consider the image format name because this JPEG-HDR and JPEG have the same image extension name.
• We have to enhance the JpegDetector class and avoid JPEG formats detection incorrectly.

What do think about this?

[peter279k]

I think the third problem will not be the issue because the detection approach is different.

[odan]

Yes, JPEG-HDR is quite identical to the classic JPEG.

But JPEG-HDR is an extension, and uses APP11 segments.

I would suggest we are trying to extract the ver (JPEG-HDRVersion) information from the APP11 JPEG Tag of a JPEG-HDR image. If this tag exists, we asume that it's a JPEG-HDR. I'm aware of the fact, that there are JPEG-HDR file without this tag, but for the most files this should be the case.

• https://sno.phy.queensu.ca/~phil/exiftool/TagNames/JPEG.html#HDR

• https://commons.wikimedia.org/wiki/File:HDRI_Sample_Scene_Window_(JPEG-HDR).jpg

• http://anyhere.com/gward/papers/cic05.pdf

• https://github.com/exiftool/exiftool/blob/b2961eb457df5ef65dcb7a842ca346bffebcbce7/lib/Image/ExifTool/JPEG.pm#L375

• https://github.com/exiftool/exiftool/blob/668f5020be3f7c1cb73759efe2d14fb30049f414/lib/Image/ExifTool.pm#L6617

• JPEG markers begin with 0xff

• APP11 (JPEG-HDR) marker: 0xeb

• If the APP11 (JPEG-HDR) marker 0xff0xeb exists, it should be a JPEG HDR image.

• Optional: Search for HDR_RI.