[CinePaint] Really basic script for batch converting.

Frank Peters wrote:

> Did it appear gapless?

They appeared gapless by eye. :-)

> You must realize that the histogram tool in cinepaint, or in other image
processing software, does have the resolution to always show the gaps.
But the gaps from conversion are there.

Absolutely, I have meant to mention that I didn't expect them to be
'mathmatically', in reality gapless.

Going back to the basic HSL, curves manipulation on 8bit images compared
to dicreet noise introduced after conversion to16bit, the histogram in
Cinepaint did show gaps after basic manipulation at 8bit, at whatever
sampling/resolution Cinepaint operates on.

So I assumed that visible gaps by eye on Cinepaints histogram would
translate to rather damaged images and increased likeliness of visibileto
the eye colour banding. Those gaps were not visible after same or worse
HSL manipulation at 16bit.

> 65536 steps is an enormous range and it is not practical to create a
histogram tool that will always reveal the fine detail. However,
specialized software can show the detail.

I've been looking for a more mathmatical histogram type tool out of
interest. Thank you, I have gnuplot installed, but never thought to use
it.

> Even this quick illustration does not do full justice to the changes. In
fact, if the horizontal axis on the second image were to be expanded,
the gaps would be seen to be even greater, while the first image would
still be perfectly uniform. But I did not want to spend a lot of time on
this.

Yes point taken, I can only go by eye, that if the image / video frame
looks good visually after all the colour correction and encoding then job
done successfully. I really appreciate your time and your images
illustrate perfectly. :-)





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