Cropped image fails to save correctly as PNG

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JiriHovorka
Posts: 1
Joined: Sun Sep 23, 2007 11:00 pm

Cropped image fails to save correctly as PNG

Post by JiriHovorka »

This error occurs in XnView 1.80 and 1.91.4 so far.

When using Crop transformation (on single image or batch conversion) on certain PNG files, some images are not saved correctly when the output format is PNG. The compression level set for writing PNGs won't change the result (still distorted).

I have come up with a workaround:
Use the same transformation on input PNGs and save them for example as BMPs.
Then batch-convert the BMPs into PNGs.



XnView is a great piece of software and i thank all involved in development.
This bug is more a nuisiance than a blocker.

Thank you.

input:
Image
output:
Image
script : http://jovo.webpark.cz/xn/transform.xbs
all files (incl. workaround): http://jovo.webpark.cz/xn/err.zip
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xnview
Author of XnView
Posts: 46255
Joined: Mon Oct 13, 2003 7:31 am
Location: France
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Re: Cropped image fails to save correctly as PNG

Post by xnview »

JiriHovorka wrote:This error occurs in XnView 1.80 and 1.91.4 so far.

When using Crop transformation (on single image or batch conversion) on certain PNG files, some images are not saved correctly when the output format is PNG. The compression level set for writing PNGs won't change the result (still distorted).

I have come up with a workaround:
Use the same transformation on input PNGs and save them for example as BMPs.
Then batch-convert the BMPs into PNGs.



XnView is a great piece of software and i thank all involved in development.
This bug is more a nuisiance than a blocker.

Thank you.

input:
Image
output:
Image
script : http://jovo.webpark.cz/xn/transform.xbs
all files (incl. workaround): http://jovo.webpark.cz/xn/err.zip
I can't view and download your samples... :?
Pierre.
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XnTriq
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Posts: 6512
Joined: Sun Sep 25, 2005 3:00 am
Location: Ref Desk

Post by XnTriq »

transform.xbs

Code: Select all

crop( 0 0 91 151 )
err.zipMotobit Online Base64 En-/Decoder)

Code: Select all

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marsh
XnThusiast
Posts: 2443
Joined: Sun May 15, 2005 6:31 am

Re: Cropped image fails to save correctly as PNG

Post by marsh »

JiriHovorka wrote: I have come up with a workaround:
Use the same transformation on input PNGs and save them for example as BMPs.
Then batch-convert the BMPs into PNGs.
The distortion effect is related to PNG/Write/[x]interlaced setting. Cropping odd number of pixels has different result than cropping an even number (with that sample image).
It makes me remember adjusting an old television set...
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