Auto-stretch output images, esp. for web interface

[schumar]

off-topic: Thanks a lot for this program, I had 2 pictures lying around I wasn't able to place (made some error when writing down my telescope's direction in the dark...), astrometry.net saved me :)

on-topic: It would be nice if pictures (esp. 16bit ones) would be auto-scaled for output; see 4073344 for an example (compare to 4074118, which I manually scaled and converted to 8bit-JPG before uploading). The picture seems to be simply black, but contains in fact a lot of stars; but that's only visible when the values are scaled by 100 or more.

I assume this would require finding the scaling factor for which e.g. 5% of pixels would over-saturate.

[dstndstn]

Oh yeah, interesting. We do something like that for FITS files, but JPEG and PNG are assumed to be "viewable" already :)

On Thu, Oct 15, 2020 at 10:37 AM Martin Schuster [email protected] wrote:

off-topic: Thanks a lot for this program, I had 2 pictures lying around I wasn't able to place (made some error when writing down my telescope's direction in the dark...), astrometry.net saved me :)

on-topic: It would be nice if pictures (esp. 16bit ones) would be auto-scaled for output; see 4073344 http://nova.astrometry.net/user_images/4073344 for an example (compare to 4074118 http://nova.astrometry.net/user_images/4074118, which I manually scaled and converted to 8bit-JPG before uploading). The picture seems to be simply black, but contains in fact a lot of stars; but that's only visible when the values are scaled by 100 or more.

I assume this would require finding the scaling factor for which e.g. 5% of pixels would over-saturate.

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