Just echoing everything Ofnuts already said. Not sure what the "eye of MATE" viewer interpolation might be. :(
On Tue, Aug 8, 2017 at 4:43 PM Ofnuts <ofn...@gmx.com> wrote: > On 08/08/17 18:37, Olivier wrote: > > I'm using GIMP 2.9 on Ubuntu Studio with MATE window manager. I'm > > scanning black-and-white photos taken slightly less than 50 years ago. > > This is working generally well, although of course I have to rotate, > > crop, and sharpen the images, and use the Levels tool a lot. However, > > for two photos a weird thing happens: the photo looks rather good when > > displayed in the GIMP window, but it looks terribly grainy when > > displayed by "Eye of MATE Image Viewer". > > > > I placed the photo at the address > http://olecarme.homelinux.net/page0022.jpg > > > > Clearly it's grainy, but not so much as in the image viewer, and in > > the GIMP window it looks acceptable at a scale of 33.33%, and even at > > a scale of 50%. > > > > Two questions: > > - May anybody provide an explanation of this phenomenon? > > - Is there a way to display the image correctly outside of GIMP? > > > > Thanks for any idea! > > > > To zoom out the image the application has to interpolate pixels. > Different applications can use different algorithms, that don't behave same > with noise (a.k.a grain). Some algorithms can even make the image look > grainier than it is, when the zoom factor is close to an integer > multiple of the grain size. > > If you want the image to display well at a given size, then make a > scaled copy of the image. Then the viewer will display it > pixel-for-pixel and you won't have to worry about the interpolation > algorithm. > > > _______________________________________________ > gimp-user-list mailing list > List address: gimp-user-list@gnome.org > List membership: https://mail.gnome.org/mailman/listinfo/gimp-user-list > List archives: https://mail.gnome.org/archives/gimp-user-list > -- https://patdavid.net GPG: 66D1 7CA6 8088 4874 946D 18BD 67C7 6219 89E9 57AC _______________________________________________ gimp-user-list mailing list List address: gimp-user-list@gnome.org List membership: https://mail.gnome.org/mailman/listinfo/gimp-user-list List archives: https://mail.gnome.org/archives/gimp-user-list
