I found the bug in Irfanview where it doesn't work properly on a large number of files

I found what the bug is in Irfanview where it doesn't do batch and
thumbnail operations on file when the folder contains a large number of
files.

First, I googled for the problem and saw in these two forums that others
had the same problem where Irfanview would only operate on a subset of the
large number of JPEG photos in any one Windows XP folder, even though all
were selected by the user.

The problem is you have to let Irfanview DRAW all the thumbnails!

For example, if you only have a thousand pictures, or even a few hundred,
in a folder, and you want to auto-rotate all those pictures losslessly, you
already know the sequence is ...

1. Open up any one digital photograph in Irfanview
2. File -> Thumbnails
3. Options -> Select All
4. File -> JPEG Lossless Operations -> Lossless Rotation with Selected
Files

Even if you follow this process EXACTLY, you will NOT get a lossless
rotation of all your files if you don't know that Irfanview has a bug where
even if you've selected all the files in a folder, if you don't WAIT for
all the thumbnails to draw AFTER you've selected them in step 3 above, then
Irfanview will only operate on those digital photos whose thumbnails did
draw at the exact time you hit the button in step 4 above.

Basically, for large numbers of files in a folder, the bug is you have to
wait ten, fifteen, maybe twenty minutes for Irfanview to finish drawing all
the thumbnails. Only then, when step 3 has completed redrawing every single
thumbnail in the folder (easily hundreds, potentially thousands), only then
will Irfanview actually operate on all the files that you THOUGHT you
selected.

Once we know this bug, others can reproduce it and confirm that the only
known workaround to this Irfanview drawing bug is to wait for all the
thumbnails to be redrawn after selection in step 3 above (even thumbnails
that do not show on the screen due to desktop size limitations).

Others should confirm this bug before we report it to Irfan himself.

 

Annu,

I found a bug in command-line processing in 4.23, reported it to Irfan,
and had a fix within a few hours. It was an area he had been working on.

Splendid service!

Why not report the problem in the IrfanView forum?
http://en.irfanview-forum.de/vb/index.php?langid=1

(I prefer a newgroup, though).

David

 

I'm afraid I don't think I have that number of images on my whole
system, let alone in one folder, otherwise I would try it.
I guess at step (3) a message box warning of delay would be better,
and step (4) disabled until the redrawing done.

 

Same here.

Yrrah

 

Blimey! I have a thousand pictures of Mrs. Thatcher alone. Not to mention
my Golda Meir collection, which is to die for.
-O

 

How many do you have of her with somebody else in the picture?

I suppose one glimpse would be lethal wouldn't it?

 

That's one hell of a porn0 collection you've got there...

 

isn't it faster to move the selected file and do the batch conversion over
there?

 

Hi Guy,
This is a GREAT idea! (and it's not obvious unless you already know that
the operation will fail if you don't wait for this count to laborously
count to the full number of files in the folder).

I had not noticed the count in the top-left corner of the title bar.
That count starts at, say, 1/500 and then counts up (e.g., 2/500, 3/500,
etc.) until it gets to 500/500 a few minutes later (time is likely
dependent on file size, machine speed, disk speed, etc.).

Even though you can run the Irfanview JPEG Lossless Rotation command BEFORE
the count gets to 500/500, you will only rotate those pictures which have
been "counted".

So, as suggested, perhaps Irvanview should gray out the JPG lossless
operation menu until the "count" is complete.

In summary, Irvanview JPEG Lossless Operations require all thumbnails to be
"counted" ... so the workaround is to wait until the title bar shows 100%
of the photos in the folder as having been "counted" before running any
JPEG lossless operations.

I wonder why Irfanview JPEG lossless operations have this "count-down"
problem while the Irfanview batch operations do not seem to exhibit this
"count-down" problem???

 

Irfanview batch conversion, afaik, does not do a LOSSLESS auto-rotation
based on the EXIF orientation data. (If it did, I'd use it because the
batch operation process is muuuuuuuuuuch faster than the thumbnail
operation process).

It's only the Thumbnail operation that exhibits the countdown problem where
you have to wait for all thumbnails to redraw (and the count in the title
bar to progress) before you can successfully run the operation. Otherwise
the operation only works on those files that did redraw by the time you ran
the operation.

Note you can run the operation at any time after selecting the thumbnails,
but the operation won't work on any of those files, even those selected,
until the count gets to those files (which could take minutes).

 

On a 4GB card, it's common for me to take over 1,000 photos which I'd want
Irfanview to automatically rotate and resize for me.

Irfanview does a GREAT job of auto-rotate and auto-resize .... but the
auto-rotate never finishes unless you know the trick of waiting a few
minutes after selecting all the files to see the count get to 500 out of
500 files.

The auto-resize does not exhibit this count-down problem and will operate
on each of the 500 files in sequence without you having to wait for the
count to get to 500 out of 500.

Interesting bug. Easy to work around once you know it. Frustrating if you
don't know this little tidbit.

 

I should note Irfanview batch thumbnail auto-rotation will only work if
your camera creates correct EXIF orientation data.

THUMBNAIL AUTO-ROTATION EXHIBITS THE COUNT-DOWN BUG:
0. Open up any one digital photograph in Irfanview
1. File -> Thumbnails, Options -> Select All
2. File -> JPEG Lossless Operations -> Lossless Rotation w Selected Files
3. Auto rotate (according to EXIF orientation, if available)

BATCH RENAME/RESIZE DOES NOT EXHIBIT THE COUNT-DOWN BUG:
0. Open up any one digital photograph in Irfanview
1. File -> Batch Conversion/Rename
2. Add All
3. Start Batch

I wonder why auto-rotation shows this count-down problem while batch rename
resize works as advertised?