XnView Software

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 ...

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 ...

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 ...

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.

See German xlation thread - das war mir nämlich auch schon aufgefallen. Evtl. dort einen Kommentar abgeben, ob die Vorschläge so passen.

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 ...

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 ...

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 ...

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 ...

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 ...

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.