edit color

[CD.Graesser]

I would use the built in image editor tool under the tab color. There you
can find the tool "Farbkurven anpassen" in german. in english it could be
called "color curves". Then use linear settings in the histogram and drag
the original diagonal curve such that the left part becomes zero = black
and right part to max = white.
That curve can be saved and reused.

examples attached:

It is probably good to convert prior to that the image to black white.

Have fun!

Christian



jdd at dodin.org <jdd at dodin.org> schrieb am Di., 25. Juli 2023, 17:27:

> Hello,
>
> I can't find a way to do this easily in digikam/showfoto.
>
> I use my phone camera to "scan" a black and white document. I get a
> photo perfectly readable, but quite difficult to print, the white paper
> come gray (and use lot of ink), printer characters are too grey.
>
> of course (:-) the characters are not equal in darkness, the lighting is
> more important on a part of the image.
>
> any clue?
>
> thanks
> jdd
> --
> c'est quoi, usenet? http://www.dodin.org/wiki/pmwiki.php?n=Usenet.Usenet
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.kde.org/pipermail/digikam-users/attachments/20230725/bbeb3e4e/attachment-0001.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: threema-20230725-195759453.jpg
Type: image/jpeg
Size: 827627 bytes
Desc: not available
URL: <http://mail.kde.org/pipermail/digikam-users/attachments/20230725/bbeb3e4e/attachment-0002.jpg>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: threema-20230725-200023673.jpg
Type: image/jpeg
Size: 910261 bytes
Desc: not available
URL: <http://mail.kde.org/pipermail/digikam-users/attachments/20230725/bbeb3e4e/attachment-0003.jpg>