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use_paired_jpg_as_mipmap#645

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wpferguson wants to merge 1 commit intodarktable-org:masterfrom
wpferguson:use_paired_jpg_as_mipmap
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use_paired_jpg_as_mipmap#645
wpferguson wants to merge 1 commit intodarktable-org:masterfrom
wpferguson:use_paired_jpg_as_mipmap

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Canon R series cameras don't include a full size embedded jpeg so generating mipmap cache for anything larger than mipmap 3 requires the raw to be loaded and processed. This script copies the paired jpeg from the RAW+JPEG pair to the full resolution mipmap. This can then be used to generate the remaining mipmap cache. The jpeg image can be discarded after being copied to the cache or retained based on a preference in Lua options.

Fixes darktable-org/darktable#19470

included a full size embedded jpeg so generating mipmap cache for
anything larger than mipmap 3 requires the raw to be loaded and
processed.  This script copies the paired jpeg from the RAW+JPEG
pair to the full resolution mipmap.  This can then be used to generate
the remaining mipmap cache.  The jpeg image can be discarded after
being copied to the cache or retained based on a preference in Lua
options.
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[FR] Option to force embedded JPEG in full-preview layout

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