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Yesterday I finished a pretty long project for me in SHO. After processing in Pixinsight, I saved the file as both an XISF and PDF. I planned to use the PDF as my posted image here on Astrobin. When I uploaded the PDF file to Astrobin it didn't look near as good as it did in XISF in Pixinsight. I ended up reprocessing the PDF file in PI because it was so faint. Anyone have a fix for that? The XISF image looks great in PI, but the PDF file alone looks faint. Thanks
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Are you new to Pixinsight? And maybe I’m behind the times, but I’ve never heard of people exporting their photos as pdfs. Usually jpg or pngs.
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PI doesn't save in Adobe PDF format, period.
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Don't save it as a PDF. I usually save my final renders as 16 bit tiff and 8 bit jpg. It's usually the jpg that gets posted to the bin.
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Yes, sorry, I meant JPEG. The quality of the JPEG is not even close to the XISF image.
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I save to Jpeg all the time from PI and it works perfectly. You were pretty light on the details of what you did so I don't mean to insult you but did you stretch the image before saving it? Just as a rule of thumb when you ask for help, the quality of the answer you get will depend a lot on how much information you supply up front when you ask your question. What exactly did you do and how did you save the image? John |
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Jeff Bennett: When saving as a Jpeg I set the 'quality slider' to 100%. You might also want to try to save it as a png. |
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Jeff Bennett: You said you had finished the project and was exporting the image. Since we are taking about exporting the FINAL image for display, not further processing, the jpg format is just fine. |
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John Hayes: full integration in PI and a final xisf file. The issue is quality of the image as a jpeg versus xisf in PI. I’ll up the quality, maybe save as a png instead. Thanks |
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Saving a processed stretched image in PI at default jpg settings is pretty good already and one thing that does NOT change is how bright the image is rendered. If your issue is with this, as you originally posted. then upping the jpeg quality won't change that. Nor does saving in PNG.
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I can't tell much difference if any at all between my PI xisf files and my PI files saved as tiffs. I have always saved as tiff coming out of PI and only convert to jpeg as a final save to upload to Astrobin. Saving as a tiff coming out of PI also skips the scary PI warning about how much PI hates saving jpegs… |
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What may be happening is that what you think is a final image still has some screen stretch active. When you look at an XIFS file PI will remember the STF setting and display it as you remember it. But if you save as a jpeg, it will not include any stf component. To be sure your final XISF file has no STF, open it then in STF click bottom right corner in the STF window to reset. |
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Just to add; this is from the FAQ What are the supported image formats? AstroBin will accept JPEG, PNG,GIF, TIFF, GIF (including animations) for images, and MOV, MPEG, MP4, AVI, WMV, WEBM for videos. TIFF support is currently experimental, and certain types of TIFF files will not work (e.g. files with internal compressions, floating-point precision, or grey-scale 16-bit, 32-bit pecision). In any case, AstroBin will convert your TIFF file to JPEG in order to display it: browsers cannot display TIFF files natively at all. The original TIFF upload will only be available to you. For this reason, we recommend you upload a JPEG and store the TIFF for safe-keeping as an uncompressed data source: members on the AstroBin Ultimate subscription plan can also upload one XISF/FITS/TIFF/PSD file to associate to each of their images. Learn more. |
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Thank you all for the help. I think I have figured out the issue. I applied a second stretch to the linear image and then went through my usual routine. maybe I hadn't stretched it before I save it, I dunno what happened. Anyway, sometimes this stuff just goes over my head…..
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Jeff Bennett:John Hayes: Again, when you report a problem and want some help fixing it, it's a good idea to be specific and complete about what you did. This description is pretty light on details and doesn't mention whether or not you stretched the data before saving it as a jpeg. Since you reported a different brightness, that relates to how you've stretched the image. Remember that in PI, there is a difference between the way the image is displayed and the data itself. Once you stretch data using something like the histogram transform, you have to be careful about how it is displayed. You could be stretching the display a second time even after you've made the image nonlinear. That will cause a jpeg file to be displayed differently than what you see on the screen in Pi. John |
