Just noted on the closed issue that I saw this problem for the first
time today. The error message returned by Qgis being
2022-04-18T01:53:51 WARNING
D1961_94CFT_92XGM_94CFW_92XGN_f6e10828_d0fa_42e6_a318_901bef99006f ::
/mnt/sharerw/mainpc/maps/References/Volume 11-12 - MSL/Station -
Dunsandel/D1961:94CFT-92XGM+94CFW-92XGN.jpg, band 1: IReadBlock failed
at X offset 0, Y offset 600: Reading this image would require libjpeg to
allocate at least 1866240000 bytes. This is disabled since above the
104857600 threshold. You may override this restriction by defining the
GDAL_ALLOW_LARGE_LIBJPEG_MEM_ALLOC environment variable, or recompile
GDAL by defining the GDAL_LIBJPEG_LARGEST_MEM_ALLOC macro to a value
greater than 104857600
In this case the raster file size is only 26 MB.
The error message is spurious as the issue is found to be caused by
using a Progressive JPEG as exported from Gimp. When the Progressive
setting is turned off in the Gimp export settings there are no problems
importing the raster in Qgis or displaying it.
My recollection is the issue of progressive JPEGs not being able to be
loaded in Qgis is not a new problem and something I first found to be
happening several years ago. I had to at that time convert all the
progressive JPEG rasters I had into non progressive. The issue may have
occurred because of a new release of GDAL or possibly when Qgis 3.0 was
introduced.
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