Jpeg

[Mr Nicholas John Atkinson]

I use a CCD camera and my LRGB files after processing in PIX insight appear fine but when saved as a Jpeg all I get is a black screen and useless in terms of uploading onto members images. I get the same result when using Maxim DL.

There must be something I am missing and would welcome feed back

[Andy Wilson]

Hi Nick,
I remembering seeing similar behaviour in Maxim DL if I didn’t set the options to save the stretched image to the dynamic range of the output file. I think what is happening is you are displaying the image with a certain stretch applied to the image brightness, setting what is dark to light. However, what is being saved is unstretched or a different dark to light stretch. This may be more important for jpeg as I think they have a limited dynamic range of 8-bit.
Best wishes,
Andy

[Nik Szymanek]

Hi Nick.
Yes, Andy is correct. If you don’t scale the image first (using the Histogram Transformation tool) the resulting JPEG file will show as a blank, black image. This also applies to TIFF format images which can be saved as both 16-bit and 32-bit files. Normal JPEGs are indeed only 8-bit but for posting online should be fine.
Cheers,
Nik

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