Version 4.1.0 and PNG files issue

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Paultx
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Joined: Sun Nov 29, 2009 12:49 am

Version 4.1.0 and PNG files issue

Post by Paultx »

The shell extension has been flawlessly working here with all supported image files, PNG included. But yesterday I received from a coworker two PNG files that can't show thumbnails.

PNG file
xnv1.png
xnv1.png (50.82 KiB) Viewed 954 times

PNG file from coworker
xnv2.png
xnv2.png (70.97 KiB) Viewed 954 times

This is odd for two reasons:

- Other PNG I already had on my system are OK as to thumbs.

- The files from my coworker are 19 MB in size and I have set the option No thumbnail for file size greater than to 120 MB.

Unless there is other explanation, my guess is that it happens because the PNG files I have on my system were created on Windows, while the coworker PNG files were created on a Mac.

My guess is right or not? TIA.


Windows 10 Pro 20H2 19042.844
Desktop: Windows 10 Pro 64-bit • Intel Core i7 • 12 GB RAM
Laptop: Windows 10 Pro 64-bit • Intel Core i5 • 6 GB RAM
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xnview
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Re: Version 4.1.0 and PNG files issue

Post by xnview »

please send me the files?
Pierre.
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Paultx
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Re: Version 4.1.0 and PNG files issue

Post by Paultx »

xnview wrote: Wed Mar 10, 2021 7:34 am please send me the files?
The Attachments tool here shows an error message saying the files are too large. How can I send them to you via this forum?
Desktop: Windows 10 Pro 64-bit • Intel Core i7 • 12 GB RAM
Laptop: Windows 10 Pro 64-bit • Intel Core i5 • 6 GB RAM
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xnview
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Re: Version 4.1.0 and PNG files issue

Post by xnview »

you can send it to me contact at xnview dot com
Pierre.
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xnview
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Re: Version 4.1.0 and PNG files issue

Post by xnview »

These files contains a iTXT data too high (default is 8000000 bytes max) for libpng
Pierre.
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Paultx
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Re: Version 4.1.0 and PNG files issue

Post by Paultx »

xnview wrote: Thu Mar 11, 2021 2:18 pm These files contains a iTXT data too high (default is 8000000 bytes max) for libpng
Thank you very much for the answer, but... it's archaic Aramaic to me! :o

What is "iTXT data"? Is it something a simple user like me can deal with? I searched online to try to understand what it is, but it seems to be something only programmers and the like can deal with.

For example, when I generate a PNG image using CorelDRAW, I have a lot of options to set, like color mode, transparency, etc. before I export it.
png_test.png

Is there a way this "iTXT data" can be modified when saving the image in the PNG format? If it's possible, I can tell that coworker to adjust things before he sends me PNG images. NB: I work with Windows, he works with a Mac.

TIA.
Desktop: Windows 10 Pro 64-bit • Intel Core i7 • 12 GB RAM
Laptop: Windows 10 Pro 64-bit • Intel Core i5 • 6 GB RAM
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xnview
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Re: Version 4.1.0 and PNG files issue

Post by xnview »

iTXT data is used to store metadata

I'll add the support for large iTXT data
Pierre.
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