[1.7.0] BIG image problem

[Kadet]

Win11 23H2 / AMD RYZEN / 32 GB RAM

There is big image Van Gogh from Wikipedia https://upload.wikimedia.org/wikipedia/ ... roject.jpg (30,000 × 23,756 / 205.1 MB).
It is opening OK in XnView MP.
But when I try to enlarge the image by 200%, it only enlarges half, the lower half is a quirk.

Saving PNG file gives only half source the image, the second is black.

IMHO, it's problem with allocate bigger memory on Windows (clear installation, not on virtual machine).

[ckit]

Confirmed, my lower half is completely black!
I won't bother saving as format as it will be the same as what I'm seeing now

[xnview]

what do you have in 'Settings>View - high zoom quality'?

[Kadet]

what do you have in 'Settings>View - high zoom quality'?

Bicubic in both Out/In.

[xnview]

try bilinear, take less memory

[Kadet]

I'm afraid there has been a misunderstanding.

When I wrote "enlarge" I didn't mean pressing the '+' key, but 'Shift'+'S' and setting here 200% enlarge. After this operation that only the upper half is correct and the lower half is incorrect.

[xnview]

yes. try bilinear, take less memory

[Kadet]

In fact, when I set the magnification type to bilinear, the image enlarged correctly.
However, the idea is to enlarge the image using any technique, e.g. Mitchell, Lanczos.
I have enough memory, that's not the problem.

IMHO, it is a problem of proper memory allocation, which in certain circumstances (large image,
zoom method) is poorly managed.

[xnview]

In fact, when I set the magnification type to bilinear, the image enlarged correctly.
However, the idea is to enlarge the image using any technique, e.g. Mitchell, Lanczos.
I have enough memory, that's not the problem.
Big_image.jpg
IMHO, it is a problem of proper memory allocation, which in certain circumstances (large image,
zoom method) is poorly managed.

Ok, the bilinear function is not the same for other filters. But i can't reproduce. In 100%, the picture is correctly displayed (with bicubic), and not in 200%. You can reproduce each time?

[user0]

to reproduce:
0. clean unzipped version
1. open image
2. press SHIFT+S to open Resize Image
- set Mode to %, value to 101%
- set Method to.. see below
- press OK
get image with black line in the bottom, sometimes crash

Code: Select all

Nearest neighbor	ok
Bilinear		ok
Hermite			bug
Gaussian		bug
Bell			bug
BSpline			bug
Mitchell		bug
Lanczos			bug
Hanning			bug
Cubic			bug
Lanczos2		bug

crash_dumps_resize_to_101percent.zip

(224.61 KiB) Downloaded 98 times

ps: memory consumption same as Kadet's - never come to 100% (I have 32Gb as well)

[Kadet]

Ok, the bilinear function is not the same for other filters. But i can't reproduce. In 100%, the picture is correctly displayed (with bicubic), and not in 200%. You can reproduce each time?

Yes, it happens every time.
Height black bottom is depending on % zoom. For 200% it's 50%. For 150% it's 25%. For 105% is a little.
When I try 110% program crash me every time. I click Update to send You info from crash.

I hope You find the bug.

Edit.
PS. When I saved a zoomed image by bilinear to png I can't read it - not in XnView, not in Windows Photo.
PS2. Save As jpegli is OK.

[xnview]

Thanks to your detailed description I can reproduce the problem.

[xnview]

This problem is supposed to be fixed in XnView MP 1.7.2. Please check and confirm the bug fix here.

[Kadet]

All is OK.