How to save in 16 bits PNG

[finstrodelapradera-subscription]

Hi Gilles

Well, my RAW (ARW from a Sony A700) are 16 bits depth. And this is what happen when I save in:

• PNG, 8 bits depth of color
• TIFF, 16 bits depth of color
• JPG, 8 bits depth of color
  

So, in my case, is not a source bits of depth problem. Something more is happening. I noticed this when comparing two images, one exported as PNG and other in TIFF (from the same RAW source) and I saw a big noticiable difference between them.

Thank you

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[Gilles Caulier-4]

I use also PNG to save my processed Sony A500 raw file. It's saved in
16 bits color depth. Go to RAW decoding control panel from digiKAm and
set 16 bits color depth processing...

Gilles Caulier

2010/5/31  <[hidden email]>:

> Hi Gilles
>
> Well, my RAW (ARW from a Sony A700) are 16 bits depth. And this is what
> happen when I save in:
>
> PNG, 8 bits depth of color
> TIFF, 16 bits depth of color
> JPG, 8 bits depth of color
>
> So, in my case, is not a source bits of depth problem. Something more is
> happening. I noticed this when comparing two images, one exported as PNG and
> other in TIFF (from the same RAW source) and I saw a big noticiable
> difference between them.
> Thank you
>
> _______________________________________________
> Digikam-users mailing list
> [hidden email]
> https://mail.kde.org/mailman/listinfo/digikam-users
>
>

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[Jonas Norlander]

2010/5/31  <[hidden email]>:

> Hi Gilles
>
> Well, my RAW (ARW from a Sony A700) are 16 bits depth. And this is what
> happen when I save in:
>
> PNG, 8 bits depth of color
> TIFF, 16 bits depth of color
> JPG, 8 bits depth of color
>
> So, in my case, is not a source bits of depth problem. Something more is
> happening. I noticed this when comparing two images, one exported as PNG and
> other in TIFF (from the same RAW source) and I saw a big noticiable
> difference between them.
> Thank you
>

Perhaps related. When i rotating a 16 bits PNG they got reduced to 8
bits. Do you do any rotating?

/ Jonas
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