Hi Emanuele,
It sounds like you have a color management issue in your imaging workflow. Think of color management as a chain that connects your pixels with the physical device that is going to reproduce your image (a monitor in this case): if a single link is broken, the whole chain ceases to work.
Follow these steps to reset your color management settings:
1. If you have calibrated your monitor with a hardware or software device, be sure your monitor has the appropriate ICC color profile assigned on your operating system (Windows I guess). If you haven't calibrated your monitor, then be sure you have the 'sRGB IEC61966-2.1' profile assigned to your monitor. If you haven't calibrated your monitor and your monitor's manufacturer has published an ICC profile for your monitor model, use it instead of sRGB.
2. In PI, select Edit > Color Management Setup. You should see the correct monitor profile on the ColorManagementSetup interface. This is selected automatically upon PI startup and you cannot change it. Click the Reset icon (bottom right corner) to make sure you have all the default options. On ColorManagementSetup, now you should have the 'sRGB IEC61966-2.1' profile selected as the default profile for both RGB and Grayscale images.
3. Click the Apply Global icon (blue sphere) or press F6. Now you have set the default color management options in PixInsight.
These are general guidelines to export images for printing or to open them in other applications:
- If you are exporting a JPEG image for the WWW, you should:
* If necessary, convert pixel values to the sRGB space using the ICCProfileTransformation tool. This is only necessary if your image has a profile embedded different from sRGB, or if it has no profile embedded and you have selected something different from sRGB as your default RGB profile (see step 2 above).
* Don't embed an ICC profile in your JPEG image for web deployment. Most browsers don't work correctly when an image has a profile embedded.
- If you are exporting a TIFF image to use it with other applications that support color management:
* Always be sure that your TIFF image has the correct profile embedded. The correct profile is the default RGB profile (step 2 above) if the image didn't have an original profile embedded (as happens when you start with a raw CCD image for example).
- If you want to print your image:
* If you're printing with PI, select File > Printer Color Management and be sure you have the correct ICC profile selected for your target printer. Read the tooltips as they provide important information.
* You should use PixInsight's color proofing and gamut warning functions to verify how your final printed result will look like. The gamut warning feature will show you which pixels will get clipped because they are out of your printer's color space, so that you can fix them (by decreasing color saturation, usually).
Hope this helps.
