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Specific Enlarge this picture to 3840 x 2160 resolution in high quality

#5
I can run it through a couple tools yet do you have a version of the image that is not at such a high compression level of JPEG? To show the issue I have extracted in clockwise fashion the Hue component, luminosity component, and saturation component. Hue and Sat are already quite off and lots of compression artifacts.
Will do best if you don' have a better original.
John Wheeler

640-HUE,-SAT,-LUM-EXTRACTED.jpg
 
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#6
I can run it through a couple tools yet do you have a version of the image that is not at such a high compression level of JPEG? To show the issue I have extracted in clockwise fashion the Hue component, luminosity component, and saturation component. Hue and Sat are already quite off and lots of compression artifacts.
Will do best if you don' have a better original.
John Wheeler
How about this? I've converted the previous picture from JPG to PNG. Will that help? 640.png
 
#7
No, all the aritfacts just carry over to the PNG. You would have to start from a better original. You may not have that I understand. Also, if you wanted a 6X on both dimensions, that would be 3840x2556. I will give it a go as others have already
 
#11
Totally agree with your assessment Argos and yes I threw the compressed JPEG through JPEG>raw and also Gigapixel. It does not always gives great results espeically with body parts. Good demonstration of the limitation of those tools (or of the pilot :) )
 

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