XnView Software

trying to convert a series of canon raw .cr2 images with nconvert
i'm finding that i have this problem:

if my image (camera is a 5d, btw) is x x x i would normally
issue a command something like nconvert -crop 286 374 3856 2169
to get an image of a 16x9 ratio.

the image produced by the above is not correct, however. in order to get
my image to crop to the right size i have to divide all of the numbers
by 2. that produces a command:

nconvert -crop 143 187 1928 2169

this produces an image that is properly cropped.

i noticed similar behaviour with irfanview a while back and, among
other reasons, switches to xnview to solve the problem. i found
that irfanview misreported the image size in addition to being unable
to crop properly. i found that xnview did report the proper image size.
now that i'm getting in a little deeper, however, i'm finding this
similar problem with the cr2 files.

what's happening here? is xnview actually reading the file at half
it's dimensions? or is it just a bug wherein the numbers need to be
halved but the data is actually correct?

thanks and will continue testing,
BabaG

oops. forgot to edit the image dimensions from x x x to
what i really work at: 4386 x 2920

although i've issued no -resize command, my cropped image
is the size it would have been if the original image was 1/4
the size it really is. iow, nconvert is performing as if my
cr2 image was actually 2193 x 1460 instead of 4386 x 2920.

to sum up, i have an image at 4386 x 2920. nconvert traets
it as though it were 2193 x 1460. if i determine my crop coordinates
on the full 4386 x 2920 image, i must divide the x/y and w/h
by 2 to get the proper image cropping output. that, however,
is still a problem because the cropped image, with only cropping,
no resizing, outputs as 1/4 the size of the expected output.
where i expect an output image of 3856 x 2169, i actually get
an output frame at 1928 x 1084.

Anonymous wrote:oops. forgot to edit the image dimensions from x x x to
what i really work at: 4386 x 2920

Ok, i'll check

thankyou pierre! you might want to have a look at another post i made
yesterday which also has to do with cr2 files. it's in the general support
forum:

http://newsgroup.xnview.com/viewtopic.php?t=12402

in brief, i ran a script on a series of matched cr2 and jpg files. the
jpg's ran correctly but the cr2 files auto-compensated the exposure
even though nothing was done to command that behaviour. perhaps
these errors are tied together in some way?

thanks again and love the program!
BabaG