[gentoo-user] resizing multiple images with adding a frame as needed

[gentoo-user] resizing multiple images with adding a frame as needed

[hw]

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?

Re: [gentoo-user] resizing multiple images with adding a frame as needed

[wabenbau]

hw <hw@gartencenter-vaehning.de> 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?

You maybe can use media-gfx/graphicsmagick or media-gfx/imagemagick 
for that purpose (I prefer graphicsmagick because it's faster).

With the composite command and it's repage parameter it should be 
possible to do what you want. But I'm not sure about this, I never
done this by myself.

--
Regards
wabe

Re: [gentoo-user] resizing multiple images with adding a frame as needed

[wabenbau]

hw <hw@gartencenter-vaehning.de> 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-image-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

Re: [gentoo-user] resizing multiple images with adding a frame as needed

[Mick]

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On Wednesday 24 Jun 2015 01:02:35 wabenbau@gmail.com wrote:
> hw <hw@gartencenter-vaehning.de> 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-imag
> 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
============================================

-- 
Regards,
Mick

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Re: [gentoo-user] resizing multiple images with adding a frame as needed

[hw]

Am 24.06.2015 um 07:35 schrieb Mick:
> On Wednesday 24 Jun 2015 01:02:35 wabenbau@gmail.com wrote:
>> hw <hw@gartencenter-vaehning.de> 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-imag
>> 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?

Re: [gentoo-user] resizing multiple images with adding a frame as needed

[hw]

Am 24.06.2015 um 02:02 schrieb wabenbau@gmail.com:
> hw <hw@gartencenter-vaehning.de> 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-image-inside-a-larger-canvas
>
> You must add a resize paremeter as this example is only for placing an
> image inside a larger canvas. :-)

Thank you very much, this looks like exactly what I was looking for :)

> You can easily find more examples in the Internet.

I tried, of course --- it seems to be a matter of using the right search 
strings ...

Re: [gentoo-user] resizing multiple images with adding a frame as needed

[Mick]

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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 wabenbau@gmail.com wrote:
> >> hw <hw@gartencenter-vaehning.de> 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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