Thread: [Linuxcommand-discuss] Resizing multiple images using Terminal

Hello,
this is my first experience with Terminal so I am a complete newbie :) 
but I need it to process multiple images which are to be used later in a 
video.
The first thing that I wanted to do was to minify the images of one 
sequence. I keep images for each sequence in separate folders. To make 
sure that the scaling will be proportional, I divided the original size 
by four and scaled first one of them with Gimp. These are the image 
dimensions:
Width: 2592 Height: 3872
And four times smaller:
Width: 648 Height: 968
The target image should have height 480 because the video will be 
720x480, but I didn't know how to write a command to change only height 
and adjust width proportionally, so to avoid distorting them I separated 
vertical images from horizontal in different folders. When the images 
are close to the target size I want to crop them (not sure how to do it 
yet).
I wrote this command line:
mogrify -convert -size 648x968 *.jpg -resize 648x968
And the answer was:
mogrify: unrecognized option `-convert' @ 
error/mogrify.c/MogrifyImageCommand/4560.

What am I doing wrong?

It seems that I always find a solution right after posting a question to 
a forum, so hopefully it will happen again this time ;)
I figured out how to scale images and read their dimensions, and now I 
only have to rename the batch so that it can appear as a sequence in the 
movie.
I successfuly changed file extensions from uppercase to lowercase, and 
looks like I'm almost there... I wrote this command line:
rename -n -v 's/(\d{8})\.jpg$/new_file_name_$1\.jpg' *.jpg
to rename photos with 8-digit names (they are like "DSC_5889.jpg") to 
sequence name followed by a number. I don't know if this 8-digit rule is 
necessary if I want to rename all of them? Anyway, the answer was:
Substitution replacement not terminated at (eval 1) line 1.

I suppose that this command is correct as it worked with changing the 
extension so maybe there is something wrong with this 8-digit rule?

Regards,
Ania

On 09/18/2011 11:40 AM, Ania wrote:
> Hello,
> this is my first experience with Terminal so I am a complete newbie :) 
> but I need it to process multiple images which are to be used later in 
> a video.
> The first thing that I wanted to do was to minify the images of one 
> sequence. I keep images for each sequence in separate folders. To make 
> sure that the scaling will be proportional, I divided the original 
> size by four and scaled first one of them with Gimp. These are the 
> image dimensions:
> Width: 2592 Height: 3872
> And four times smaller:
> Width: 648 Height: 968
> The target image should have height 480 because the video will be 
> 720x480, but I didn't know how to write a command to change only 
> height and adjust width proportionally, so to avoid distorting them I 
> separated vertical images from horizontal in different folders. When 
> the images are close to the target size I want to crop them (not sure 
> how to do it yet).
> I wrote this command line:
> mogrify -convert -size 648x968 *.jpg -resize 648x968
> And the answer was:
> mogrify: unrecognized option `-convert' @ 
> error/mogrify.c/MogrifyImageCommand/4560.
>
> What am I doing wrong?
>