On Monday 29 Jun 2015 16:34:16 hw wrote: > Am 24.06.2015 um 07:35 schrieb Mick: > > On Wednesday 24 Jun 2015 01:02:35 [email protected] wrote: > >> hw <[email protected]> wrote: > >>> Hi, > >>> > >>> suppose I have a number of images that need to be displayed side by > >>> side in a nice layout. The images are of different sizes and have > >>> different aspect ratios. > >>> > >>> To fit the images into the layout, I can scale the images either by > >>> height or width or by percantage, and they will look messy in the > >>> layout because I need to keep their aspect ratio when scaling them. > >>> > >>> So what I need to do is put a frame around each image just as needed > >>> when scaling it so that I will end up with all the images having the > >>> same size while maintaining their aspect ratio. > >>> > >>> I guess 'convert' (from imagemagick) or 'ffmpeg' can do this, yet I > >>> couldn't find out how. > >>> > >>> > >>> (In this particular case, I would set a default size to scale all > >>> images to rather than doing something more complicated like examine > >>> all images in advance to compute a good size to use from the largest > >>> or smallest one or from their average dimensions.) > >>> > >>> > >>> Any ideas how to do this? > >> > >> Look here: > >> > >> http://stackoverflow.com/questions/1787356/use-imagemagick-to-place-an-i > >> mag e-inside-a-larger-canvas > >> > >> You must add a resize paremeter as this example is only for placing an > >> image inside a larger canvas. :-) > >> > >> You can easily find more examples in the Internet. > >> > >> -- > >> Regards > >> wabe > > > > Give this a spin, or modify accordingly to suit your needs: > > > > ============================================ > > #!/bin/bash > > for i in *.JPG; do > > > > name=${i%.JPG} > > convert -resize 900x675 ${i} ${name}_s.jpg > > > > done > > ============================================ > > This doesn't add a frame to keep the aspect ratio, or does it?
No, the above example will resize it to the dimensions you give it. You can however define the '-geometry' instead and do it in many different ways so as to preserve the aspect ratio. For example if you only give it '- geometry width', then the hight will be automatically adjusted to preserve the current aspect ratio. If you only give '-geometry xheight' then the width will be auto-adjusted to retain the aspect ratio. You can also use scale% as a geometry parameter to increase the image by a particular percentage. Have a look at: file:///usr/share/doc/imagemagick-6.9.0.3/html/www/command-line- processing.html#geometry (depending on your version of imagemagick) for more information. -- Regards, Mick
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