I would like to add the width and height informations at the “pattern for the thumbnail tooltip” in lighttable, but I don’t know how to proceed. I tried to add the str $(EXIF_WIDTH) and it appears in the description exactly as I wrote it - "$(EXIF_WIDTH)" - without any value. Can anyone help me?
$(WIDTH.RAW) width of RAW data in pixels after RAW crop
$(HEIGHT.RAW) height of RAW data in pixels after RAW crop
https://docs.darktable.org/usermanual/development/en/special-topics/variables/
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Thank you very much 
Not addressing your original question, but I have added to darkroom the image information for pixels after cropping so I can quickly calculate how big the image can be printed at 300PPI.
$(WIDTH.CROP)x$(HEIGHT.CROP)px is what I have added to the pattern for image information. Others might want to do this as well or maybe not.
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@Alan_Ford , @Terry
Please enclose your pattern strings between ` characters so they are not interpreted as formatting instructions for the forum.
Alternatively:
Use
```text
Some formatting pattern here
```
Or add an empty line, begin the next line with 4 spaces, add the formatting string, add an empty line.
For example: (WIDTH.CROP)x(HEIGHT.CROP)px (this was between ` marks), or the ‘text’ block:
(WIDTH.CROP)x(HEIGHT.CROP)px
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Thanks @kofa for pointing out what may have been confusing. Here is a screenshot of my preference settings for image information line. I thought the user posting the original question may also want to consider the image size post cropping. I love how the image information line is so customisable in DT. The exposure bias information is important to me since I shoot bracketed images and DT can make the bracketed shots look identical because it by default corrects for camera compensation.
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Thank you
Good idea, Terry, I’m stealing it. Up to now, I’ve just been updating this line to show “ISO 200” instead of “200 ISO” (I don’t know anyone who expresses ISO in the latter format).