[Digikam-devel] [Bug 150801] Thumbnail and image view does not update after editing image

Gilles Caulier caulier.gilles at gmail.com
Sun Oct 14 09:17:35 BST 2007

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------- Additional Comments From caulier.gilles gmail com  2007-10-14 10:17 -------
>1 Create image using scanner as PNG
>2 Use digikam editor on PNG file and save as PNG (preview tag is added)
>3 Save as JPG file, preview tag is copied into jpg.

==> normally it's impossible. the code disable IPTC preview tag to be stored in JPEG file. I'm sure, a bug report have been open in the past and i have fixed this one (0.9.0 release if i remember)

Why iptc preview is depreciate with JPEG. Because this iptc tag size can be set to 256Kb and a JPEG section is just limited to 64Kb. If you try to do it, JPEG file contents become invalid. Also, Exiv2 will not record preview iptc tag if content is too large to be stored in JPEG. In all case, digiKam witch use Exiv2 will never record preview in JPEG file...


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