[Digikam-users] Import from scanner problems

[Andrew Goodbody]

On 30/01/13 09:49, Andrew Goodbody wrote:
> I am trying to scan some colour negatives. In response to Dmitri Popov's
> article
> http://scribblesandsnaps.com/2013/01/29/process-film-negatives-with-digikam/
> I am trying to make use of digikam for this.
> I can use xsane to produce a full colour scan of the negatives, saved as
> png or tiff. I then use digikam image editor as described in the article
> mentioned above. This works very well but I wanted to eliminate the use
> of xsane.
> So I tried to use the Import from scanner function in digikam. Apart
> from a bug that causes a segfault in digikam when I launch the scanner a
> 2nd time I have another problem. The preview looks as it should, ie just
> like the film negative, a reddish brown rectangle. However when the scan
> is completed and the image is saved then it has a very strong blue cast.
> The thumbnail shown in digikam is still reddish brown but the main image
> shows this blue cast. I presume that some sort of colour correction is
> being applied but I don't know how to stop that happening. Anyone know?
>
> I just need a faithful scan of the negative so that the film negative
> inversion can do its job. This blue cast is interfering with that.
>
> Andrew

I should also have mentioned that the scanner is returning 16bit data, 
of which the top 12bits are significant, and digikam is truncating that 
to 8bit data at the end of the scan.

Andrew