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Support for Canon Automatic Lighting Optimizer EXIF flag in newer (CR3) files #19967

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Support for Canon Automatic Lighting Optimizer EXIF flag in newer (CR3) files #19967

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b6790d5
Call dt_exif_img_check_additional_tags() in dt_imageio_open_libraw()
cytrinox Dec 21, 2025
dcbdf22
Check for Canon Automatic Lighting Optimizer EXIF flag in newer (CR3)…
cytrinox Dec 21, 2025
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12 changes: 12 additions & 0 deletions src/common/exif.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -1160,6 +1160,18 @@ static void _check_highlight_preservation(Exiv2::ExifData &exifData,
else if(state == 2)
img->exif_highlight_preservation = 0.66f; // estimated strength for Strong
}
else if(FIND_EXIF_TAG("Exif.CanonLiOp.AutoLightingOptimizer"))
{
// Canon CR3 contains another tag, but same enum values
// [0] state - 0=standard, 1=low, 2=strong, 3=off
const long state = pos->toLong(0);
if(state == 0)
img->exif_highlight_preservation = 0.50f; // estimated strength for Standard
else if(state == 1)
img->exif_highlight_preservation = 0.33f; // estimated strength for Low
else if(state == 2)
img->exif_highlight_preservation = 0.66f; // estimated strength for Strong
}
else if(FIND_EXIF_TAG("Exif.Fujifilm.DevelopmentDynamicRange") // manual mode DR100/DR200/DR400
|| FIND_EXIF_TAG("Exif.Fujifilm.AutoDynamicRange")) // auto mode
{
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2 changes: 2 additions & 0 deletions src/imageio/imageio_libraw.c
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Expand Up @@ -487,6 +487,8 @@ dt_imageio_retval_t dt_imageio_open_libraw(dt_image_t *img,
img->buf_dsc.filters = raw->idata.filters;
}

dt_exif_img_check_additional_tags(img, filename);

// For CR3, we only have Bayer data and a single channel
img->buf_dsc.channels = 1;

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