[gdal-dev] Create COG jpeg tiles with JFIF APPn markers

[Rahkonen Jukka (MML)]

Hi,

I would like to inform that you did write mail to the right place even you have not received any answers yet. Unfortunately your question is too specific for most GDAL users and capable developers are very busy as you can see from the GitHub activity. Let's still hope that somebody reacts.

-Jukka Rahkonen-

Lähettäjä: gdal-dev <gdal-dev-bounces at lists.osgeo.org> Puolesta Jose Calvo
Lähetetty: tiistai 29. maaliskuuta 2022 9.59
Vastaanottaja: gdal-dev at lists.osgeo.org
Aihe: [gdal-dev] Create COG jpeg tiles with JFIF APPn markers

Hi.

Currently my c++ app creates COG files from GeoTiff tiled files.


GeoTiff files are created using JPEG compression with YCBCR photometric using following creation options:

  *   PROFILE=GeoTIFF
  *   TILED=YES
  *   BLOCKXSIZE=xxx
  *   BLOCKYSIZE=xxx
  *   COMPRESS=JPEG
  *   PHOTOMETRIC=YCBCR
  *   JPEG_QUALITY=xx
  *   JPEGTABLESMODE=0
>From this Geotiff files, app creates COG tiled files using following options:

  *   BLOCKSIZE=xxx
  *   OVERVIEWS=FORCE_USE_EXISTING
  *   COMPRESS=JPEG
  *   QUALITY=xx
Those tiles contain normal JPEG markers (SOI, SOF0, DQT) but no JFIF marker (APPn) is added. How can I ensure adding this JFIF marker?

I'm using gdal 3.1.0.7 in a ubuntu 20.10 using both strategies:

  *   internal jpeg and tiff code: --with-jpeg=internal --with-libtiff=internal
  *   external jpeg and tiff libraries: libjpeg.so.8.2.2 libtiff.so.5.5.0
Thanks in advance.

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