Search found 11 matches

by stephan_g
Sun Jan 06, 2008 7:36 pm
Forum: Classic - Bug Reports
Topic: "Automatic levels" adjustment wrongly implemented
Replies: 12
Views: 5280

There is a utility called "JPG-Illuminator" which was written because common image editing tools proved to be unable to correct the exposure on a real-life underexposed image. The discussion leading to this is highly interesting but unfortunately in German. The classic "oldschool" brightness adjustm...
by stephan_g
Mon Dec 31, 2007 12:16 pm
Forum: Classic - Bug Reports
Topic: 256 colors: Worse than 1.91.4?
Replies: 0
Views: 545

256 colors: Worse than 1.91.4?

It looks like reduction to 256 colors (no dithering) in 1.92 may give worse results than the old 256 colors (adaptive) implementation found up to 1.91.4. In a sample image containing lots of white (255,255,255) background, the maximum value is (252,254,252). This also leads to a common red tone (255...
by stephan_g
Mon Dec 31, 2007 2:20 am
Forum: Classic - Bug Reports
Topic: "Automatic levels" adjustment wrongly implemented
Replies: 12
Views: 5280

One could call the current implementation "Stretch histogram (linear)" or somesuch, and "Automatic contrast" would become "Automatic contrast (linear)" for consistency. The "real" "Automatic levels" function would need to go into the "Adjust" submenu anyway, where the manual version already resides....
by stephan_g
Sun Dec 30, 2007 7:05 pm
Forum: Classic - Bug Reports
Topic: "Automatic levels" adjustment wrongly implemented
Replies: 12
Views: 5280

Re: "Automatic levels" adjustment wrongly implemen

xnview wrote:Yes, currently auto-levels is not like that. but perhaps a good idea to have a basic auto-levels like you said...
I wonder what the current implementation would be good for. :?: One is obviously not well advised to use it for real-life photos or scans, as the results can be highly peculiar.
by stephan_g
Sun Dec 30, 2007 2:08 am
Forum: Classic - Bug Reports
Topic: "Automatic levels" adjustment wrongly implemented
Replies: 12
Views: 5280

See German xlation thread - das war mir nämlich auch schon aufgefallen. Evtl. dort einen Kommentar abgeben, ob die Vorschläge so passen.
by stephan_g
Wed Dec 26, 2007 1:44 am
Forum: Classic - Suggestions
Topic: Show min/max brightness in "Levels"
Replies: 0
Views: 481

Show min/max brightness in "Levels"

Re: Image >> Adjust >> Levels It would be quite handy if the current absolute lowest and highest brightness values could be shown in this dialog. Why? Consider a typical scan of a schematic or similar - lots of nominally white background, much less area taken up by (important) darker structures. The...
by stephan_g
Wed Dec 26, 2007 1:21 am
Forum: Classic - Bug Reports
Topic: "Automatic levels" adjustment wrongly implemented
Replies: 12
Views: 5280

"Automatic levels" adjustment wrongly implemented

Re: Image >> Map >> Automatic levels What I think this was intended to do is the same as possible with Image >> Adjust >> Levels, but with automatic setup of black and white point according to minimum and maximum Y value found. It, however, doesn't do that - after determining the present brightness ...
by stephan_g
Wed Dec 26, 2007 12:47 am
Forum: XnView Classic - Translation
Topic: *** German translation - Deutsche Übersetzung [German]
Replies: 224
Views: 97114

Es gibt da eine Übersetzung, die mir schon lange im Magen liegt: Menü "Bild" >> Anpassen >> Stufen Im Original heißt das "Levels", das haut inhaltlich m.E. hin. Nur durch Ausprobieren habe ich herausgefunden, daß sich hinter dem rätselhaften "Stufen" die höchst praktische Einstellung von Schwarz- un...
by stephan_g
Tue Dec 25, 2007 11:36 pm
Forum: Classic - Suggestions
Topic: High-quality arbitrary-angle rotation
Replies: 8
Views: 2881

High-quality arbitrary-angle rotation

Currently XnView supports two quality modes of rotation by arbitrary (custom) angles: 1. Crappy - nearest-neighbor interpolation. 2. OK - with "smoothing" checkbox enabled, does bilinear interpolation or somesuch. What about a really high-quality option that uses e.g. the excellent Lanczos algorithm...
by stephan_g
Fri Jun 01, 2007 1:03 pm
Forum: Classic - Suggestions
Topic: Optional subpixel sampling for high-Q zoom
Replies: 1
Views: 1260

Optional subpixel sampling for high-Q zoom

This is a trick that some camera manufacturers use to squeeze more resolution out of their displays (where 320x240 is considered high-res); the infamous MS ClearType also employs it. It requires that the subpixel structure of the display (monitor) be known, since just that is used (something a user ...
by stephan_g
Thu May 31, 2007 10:39 pm
Forum: Classic - General Support
Topic: XnView and X-Win32
Replies: 6
Views: 1561

It's been a while since I used X-Win32. When I needed an X server more recently, I installed Xming - and that gets along with XNView just fine. Might be worth a shot.