XnView Software

What is wanted:
Batch reduced images height to 1080 pix, whether they are in portrait or landscape, but if their height is already 1080 or less, do nothing.


open XnConvert 1.8
1/ select an image having a height say of 1080 pix.

2/ In "Action" add "Resize" as filter, NO other active action
Select "Height" (Hauteur)
size 1080 (viz, the same height as the input image)
select "reduce only"(réduire seulement)

3/output
same folder, add _ as prefix.

4/ Execute.

Results:
Hashing input and output show different signature

Expected behaviour
output image must be identical to input, as only filter is resize and parameters exclude action.

Bug?

Thanks

P.S. At execution I get "The 'CPU Core" settings is disabled, can't be used with 'Ask' mode, or multipages, PDF files"

the resize is not made, but file is written in the format, not copied. So for example with jpeg, you can have a re-compress

I don't understand the answer.
If, in this example if I take a jpeg of 1080 height.
I would expect with the settings do nothing in that case.

Because
Suppose, I have 10 jpeg: 6 have a height > 1080 and 4 are of height 1080
I overwright the original jpeg with the reduced one.

Now if I batch select the 10 jpeg it ought to process only the 6 larger than 1080
In term of CPU & HDD it also also much faster, especially if one consider not 10 jpegs but hundreds.
Setting the resize to 1081, would do the job for the 4 of height of 1080, but the 6 others would be resized to 1081

it's a batch convert, output files are always written

xnview wrote: Tue Feb 04, 2020 10:18 am it's a batch convert, output files are always written

Currently all input files are opened and then resaved even if no actions are selected...

A request has been made to add a 'conditional conversion' option, in effect to 'only convert if a specified condition is satisfied' which would avoid resaving unchanged files, and also speed up conversion when processing a large number of files.