Image filters

Thursday 30 August 2007 3:23:29 am

Hello,

I would like to add an alias "thumbnail" to images uploaded. This thumbnail must be square (like 100*100). The idea is to scaledown first the image uploaded and then cropping it to obtain a square (the inverse is also possible : crop and then scaledown).

The problem is that I must match the shorter side to have a clean square, or at least I have to know the size of the original image to then use it to crop with the right side size.

Do you know if something like that is possible ? Or maybe it's possible to define a new imageFilter...

Thanks

Thursday 30 August 2007 5:34:42 am

Hello Georg and thanks for your reply :-)

I've never used ImageMagick, and so I don't really understand the filters you describe (Is there somewhere an explanation about how to use these settings ?), I don't understand what does mean %1,...

Is it possible to do such a thing with standard GD2 ?
In PHP manual coding, what I usually do is first measuring the image, take the smallest value and crop with that value, and then I resize. The thing is that here I can't know the size of the image by advance... So I can't crop precisely.

Is there an issue for that ?

And about ImageMagick, do I have to change something in the image.ini.append.php to use it ? I think I must have ImageMagick installed on my computer, ain't I ?

Thanks for your help

Saturday 01 September 2007 7:13:37 am

Thank you, I will try :-)

Saturday 08 August 2009 10:11:24 am

thanks, georg!

to increase quality of my thumbnails i added a quality setting and a sharpening filter. from my image.ini.append.php:

[ImageMagick]
Filters[]=thumb=-resize 'x%1' -resize '%1x<' -resize 50% -quality 90
Filters[]=centerimg=-gravity center -crop %1x%2+0+0 +repage
Filters[]=sharpen=-sharpen 0.5

[gallerythumbnail]
Reference=
Filters[]
Filters[]=thumb=200
Filters[]=centerimg=100;100
Filters[]=sharpen=

cheers, meinhard.

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