PixInsight Forum (historical)

PixInsight => Tutorials and Processing Examples => Tips & Tricks => Topic started by: viktorcech on 2011 August 24 10:08:07

Title: problem with saving?
Post by: viktorcech on 2011 August 24 10:08:07

i have another question, about saving..
open filt (fit), stretch, dynamic back. extractions, save as TIFF..
(http://foto.podstromami.com/albums/zdielane/1.jpg)

then i open that tif in fotosop and i see picture like that fit with no changes..
(http://foto.podstromami.com/albums/zdielane/2.jpg)

Title: Re: problem with saving?
Post by: Nocturnal on 2011 August 24 10:18:11

STF is SCREEN Transfer Function. It does not modify your image. Review Harry's video on the topic please.

Title: Re: problem with saving?
Post by: viktorcech on 2011 August 24 10:25:32

this is not my image.. but i tried saving my images in pixinsight and it was OK.. only this image a cant save.. in my images i used STF, then i save image and continue processing in photoshop with no problems..

Title: Re: problem with saving?
Post by: zvrastil on 2011 August 24 11:55:29

Hi Viktor,

as Sander wrote, from your screenshot is clear that you have ScreenTransferFunction applied. This means that you don't see actual pixel data (data which will be saved), but data modified by nonlinear histogram stretch. To see actual pixel data, simply reset ScreenTransferFunction module - make sure you have "Track Active View" switched on, your image selected and then press "Reset" button. Now you see what you'll see in Photoshop.
To actually modify pixel values, use HistogramTransformation module instead of ScreenTransferFunction. Use STF when you want to see what's in the image without changing it.

regards, Zbynek