Do not save the processed saving the image in a different format to xisf

[alberto.garciasanchez73]

Hello,

I have problems when saving a processed when saved in a format other than xisf, such as Fits  or TIFF image. Opening it with any other photo editing program is as if he had gone all the processing performed and displayed dark without details. Anyone know what might be happening? I am using PI version 45 evaluation days worse than I know has no variation in functionality compared to the commercial version.

Thanks.

[Carlos Milovic]

Most probably you applied an STF to visualize the data, but you have not applied any histogram function to delinearize it. STF is just for visual inspection, rendering, it does not change the data itself.

[alberto.garciasanchez73]

Hi, I have applied a real stretch using the histogram, that is not the problem. It's a shame because I was determined to buy the program, but with this problem I daren't at least until it is resolved.

Thank you

[msmythers]

It sure sounds like your not actually applying the histogram stretch. It's a very common problem for new users.

Here is a short video(without audio) showing a shot of Cygnus that hasn't been processed. It is a .xisf file. I first show it with STF auto linked and then unlinked to get a more color balanced image. I then drag and drop the STF instance onto the bottom bar of HistogramTransformation. I apply the check to see the histogram change. I then reset STF to show the actual image before the stretch. I then drag and drop the HistogramTransformation instance on the image to apply the stretch. I could also click the square button. One of those steps must happen for the stretch to be applied to the image when using HistogramTransformation. Finally I save as a TIFF using the default settings. That is all in PI.

Now I open the image in Windows Photo Viewer to see the saved image. Opening the properties you can see it is a TIFF file.

https://drive.google.com/file/d/0B13r3kYqTf8NWnNzaE1hMWlaeU0/view?usp=sharing


As a note: If you apply a histogram stretch via any method in PixInsight to an image that has STF applied your image will become much brighter then expected. You must reset STF to see the image properly. That is why I reset STF before applying HistogramTransformation.



Mike

[alberto.garciasanchez73]

Thanks for the video Mike,

in theory is the process I followed but it is possible that at some stage I was wrong. I will try again today to make the process and see if it works.

A greeting.
Alberto.

[Cosmick]

in theory is the process I followed but it is possible that at some stage I was wrong.

Are you saving in 16 bit format or 32 bit ?

[msmythers]

You can save the tif output as 32, 16 or 8 bit and in Windows Photo Viewer they each display fine. I can't tell how other software would handle them. They might not be able to use 32 bit floating point which is the default sample format from PixInsight.


Mike