TIFF Problems

Gr4h4m

New member
Jul 7, 2020
3
0
I'm having some issues exporting TIFF files from PixInsight.

Yesterday I was applying the Screen Transformation Function to the Histogram and then saving the image as a 16bit TIFF for further processing in Photoshop.....no issues.

Today, however, when I do the same thing the exported TIFF file is much darker than what the preview shows in PixInsight.

I can't seem to work out what I'm doing wrong as I don't think I'm doing anything different to what I did yesterday.

The first screenshot shows what the image looks like after I've applied the STF to the Histogram.

The second screenshot is how the 16bit TIFF file displays once saved.
 

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ngc1535

Well-known member
Feb 1, 2014
503
53
G

Even though you claim you saved the image as a 16-bit file... what you are displaying is exactly the result if you (accidentally) save as an 8-bit TIFF out of PixInsight. Could you try again..and make certain it is 16bit?
-adam
 

Gr4h4m

New member
Jul 7, 2020
3
0
I've added a link to the file.

There's definitely something going on as, even when exporting as a TIFF, the file size appears to be reduced massively.

After a bit of trial and error I've realised this isn't specific to PI. I imported the TIFF into Photoshop straight from Deep Sky Stacker and, again, when exporting from Photoshop, I get the same dark image.

https://www.dropbox.com/s/uq9nrzivoqfawh1/NGC6188 - Ha - Photoshop.tif?dl=0

I've just exported the same image as a JPEG and had no issues so the issue is confined to TIFF files.
 
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