Resizing a image to fit a particular size
Eric Jacoboni
length/width ratio is 4/3. I use to send these pictures to a online
lab that produce paper printing and send me back. Infortunately, the
standard photo paper sticks to the 24x36 format, where the length/width
ratio is 3/2 (the photo paper is 15x10 cm).
I've two options :
- asking for nothing : the lab doesn't modify my picture, hence the
result is two white margins on the left and on the right (for
landscape shots).
- asking for fit to the paper size : the lab resizes my picture and
silently cut the top to produce a full 10x15 picture.
What i want to do is to cut myself my pictures, in order to fit the
photo ratio then send them to the lab (i prefer to choose what to cut).
I've searched various docs on the web relating to this problem, but
i've found nothing relating to do so with Gimp... Only with
Photoshop. I imagine it's possible but, as i'm rather rookie with
image manipulation, i don't know how to begin.
Any clues?
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Éric Jacoboni, né il y a 1330551067 secondes
Frank Ranner
The Gimp has a crop tool (the scalpel to the right of the magnifying
glass). Load you picture, select the scalpel, and then drag out your
crop box. The upper left and lower right corners can be used to adjust
the size, the upper right and lower left corners move the box.
You also have the dialog box that you can type co-ords into directly.
One you have set the size, click inside the box to crop the image, then
save it.
If you want to do a bunch of images, cropping from the same x-y point
then look into ImageMagic. This has a command line image processor that
you can use to process a batch of pictures (cropping, resizing, adding
borders, changing format, etc.)
Hope this helps.
Frank Ranner
Dave Neary
> What i want to do is to cut myself my pictures, in order to fit the
> photo ratio then send them to the lab (i prefer to choose what to cut).
I do this by using the rectangle selection tool - first, double
click the tool to bring up the options, and toggle the "constrain
size/aspect ratio" checkbox, and set width 3, height 2 (or,
indeed, width 1500, height 1000, if you want to fix the size of
your images).
Then, after starting the selection (in the event where you're using
the 3:2 aspect ratio) , hold down Shift and drag out the
selection in which you're interested. In the event where you're
constraining size (using 1500x1000), just drag the selection and
you should see the selection appear.
If you have a rough idea of the image you want, drag out guides
to frame it, before using the rectangle select. To position
guides more accurately near the edges and minimise loss of image
data, do this while zoomed in to 8:1 or more.
Once you are happy enough with the size of the selection, use
Alt-drag to move the selection to exactly where you want it. This
way, I can get a nice 1500x1000 image (or 1950x1300, for images
that are 2048x1536). Then use the crop tool to crop to selection.
> I've searched various docs on the web relating to this problem, but
> i've found nothing relating to do so with Gimp... Only with
> Photoshop. I imagine it's possible but, as i'm rather rookie with
> image manipulation, i don't know how to begin.
Begin, as the master said, at the beginning, and work through
until the end, at whch time you should stop.
Cheers,
Dave.
--
David Neary,
E-Mail: bolsh at gimp dot org
CV: http://www.redbrick.dcu.ie/~bolsh/CV/CV.html
Eric Jacoboni
Dave> Once you are happy enough with the size of the selection, use
Dave> Alt-drag to move the selection to exactly where you want it. This
Dave> way, I can get a nice 1500x1000 image (or 1950x1300, for images
Dave> that are 2048x1536). Then use the crop tool to crop to selection.
Thanks for your help. Unfortunately, alt-drag doesn't work as
expected on my box: if i drag the mouse while pressing Alt Key, it
moves the whole window (that's the usual X11 behaviour), if i do the
same thing with the "Alt-Window" key, it moves the selected part of
my image, not only the selection...
Dave> Begin, as the master said, at the beginning, and work through
Dave> until the end, at whch time you should stop.
Nice idea...
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Éric Jacoboni, né il y a 1330648538 secondes
Olivier Ripoll
>
> Thanks for your help. Unfortunately, alt-drag doesn't work as
> expected on my box: if i drag the mouse while pressing Alt Key, it
> moves the whole window (that's the usual X11 behaviour)
X11 is not responsible for that. That's usual "Window Manager" behaviour.
Depending on your window manager, you have two solutions:
-KDE has a toggle somewhere in its configuration tool for disabling the
alt-drag
-Some others will treat CTRL-ALT-Drag as if it was ALT-Drag. E does this.
Blackbox does I think, and WM also I guess.
> , if i do the
> same thing with the "Alt-Window" key, it moves the selected part of
> my image, not only the selection...
this means Alt-window it not used at all.
Sincerely,
Olivier.
--
--------------------------------------------
Olivier Ripoll
Institut de Microtechnique
rue A.-L. Breguet, 2
2000 Neuchātel
Suisse
tel. : (+41/0) 32 718 32 82
fax. : (+41/0) 32 718 32 01
e-mail : olivier...@unine.ch
--------------------------------------------
Dave Neary
>Dave> Once you are happy enough with the size of the selection, use
>Dave> Alt-drag to move the selection to exactly where you want it.
>
> expected on my box: if i drag the mouse while pressing Alt Key, it
> moves the whole window
This is a window manager setting, as someone else has pointed
out. And I would suggest a bad one, because Alt is a modifier key
for a lot of apps, not just the GIMP, although the GIMP is one of
the few that use Alt, Ctrl, Shift and combinations of them to
modify mouse-drag behaviour. I would suggest changing the
combination for moving windows. My own window manager uses
Button1-drag in the toolbar, or Button2-drag on the frame. And it
always passes all mouse events through to the app if I click
inside the window.
Hope this helps,
Eric Jacoboni
Olivier> X11 is not responsible for that. That's usual "Window
Olivier> Manager" behaviour.
Yes, you're right...
Olivier> this means Alt-window it not used at all.
Fixed. Alt was considered as Modifier key by my WM. Changing this
modifier key to Meta let Alt works as expected with Gimp.
Thanks for the clue.
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Éric Jacoboni, né il y a 1330772817 secondes