Questions[image-viewers](ubuntu)

On Windows, I've been using IrfanView as my image viewer of choice for about 15 years. I use it for things like resizing, cropping, flipping and rotating images; converting between different formats; and also certain effects such as blurring or obfuscating part of an image where there is sensitive data.

On Kubuntu 19.10 I've got Gwenview as the default image viewer. It caters for most of my use cases above, but I haven't yet found a way to obfuscate an area of an image.

I've also tried running IrfanView itself under Wine, but the problem there is that it can't see the Linux filesystem, making it pretty useless. I also don't know how to get it into an Open with... context menu when I right-click an image.

I had also written my own cross-platform alternative to IrfanView a few years back, but although it supports some nice image transformations, it still lacks some basic features such as copy & paste as well as area selection.

So basically, what's the easiest way to have a lightweight image viewer with simple editing functions and filters that works as closely to the Swiss army knife that is IrfanView as possible, and be able to obfuscate parts of images with it? (I'm looking for specific features, not just for any alternative.)

Possible solutions that would be acceptable:

• Some way for Gwenview to obfuscate parts of an image
• Other software that can cover all the features I need
• Getting IrfanView under Wine to be able to see images on the Linux filesystem

I have a 1.8GB TIF image that I'm trying to open on my machine with Ubuntu 18.04.1 LTS. I have 8GB of RAM and 2GB of swap space. However, I can't open the image on the stock Gnome Image Viewer (says "Dimensions of TIFF image too large"), or Shotwell (says "Photo source file missing: [path to the file]"), or Gimp (bugs out), or on my Windows 7 VM with 4GB of RAM (says too little RAM even though it had over 2.5GB free), or feh, which behaves like this:

$ feh DO_NOT_OPEN.tif
TIFFFetchNormalTag: Warning, Incompatible type for "RichTIFFIPTC"; tag ignored.
feh WARNING: DO_NOT_OPEN.tif - No Imlib2 loader for that file format
feh: No loadable images specified.
See 'man feh' for detailed usage information

Is there any way to open this image on Ubuntu?

(For the curious, the image is this one. I named it like that because the first time i tried to open it crashed my computer ¯_(ツ)_/¯ )

I'm working on some pixel art but when I preview it in something like eye of gnome, the image gets blurry instead of showing crisp pixels. I know this sounds backwards, but how do I prevent that?

Opening the file in GIMP shows crisp pixels as expected but GIMP is really big to just view photos quickly.

I am having problems with image quality when reducing images or zooming out in certain applications. It looks almost as if the image is not being smoothed or anti-aliased.

On the left is gthumb/eog (look the same) - on the right is gimp. Left one is clearly broken. It never used to be like that. Those are at 20% zoom.

Eye of Gnome (EoG) and GThumb both suffer from it when resizing to reduce, and when zooming out to reduce, but oddly Gthumb doesn't suffer when generating thumbnails. Shotwell and Gimp are unaffected. Libre Office is affected.

Given this, I wonder if anyone might know which component(s?)/issues are the cause? I'm on a 64-bit precise with NVidia 8800 GTX (nouveau).

EDIT: Additional information. If i use the tools dropdown button in the top toolbar of Gthumb, it reduces images size and retains full quality. If I instead click the paint palette at the top right to enter Edit Mode, and resize from in there, it loses quality. The "high quality" check box makes a difference but not significantly. The zoom also loses quality. I am wondering if perhaps it doesn't have 2 rendering modes and 1 is broken?

EDIT 05May2012: I have since discovered that

(a) The image quality for EoG and Gthumb suffered its regression in Oneiric (Maverick, Natty work fine).

(b) It is not limited to Ubuntu, it also affected Fedora 16.

So I'll take as an accepted answer anyone who can either fix that or advise me how to go bug reporting this. I don't really know which packages to apply it to, or whether it needs to go to Ubuntu or GNOME. Thanks!

I recall an Edit Image button in 11.04 that would bring up a second window with a Crop button easily visible.

But now, in 11.10, I see no such button. In fact, I can't find a way to crop at all from the default image viewer.

How can I crop an image from the default image viewer?