Forums / Setup & design / Image filters

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Image filters

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Author	Message
Jérôme Vieilledent	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
Georg Franz	Thursday 30 August 2007 3:40:14 am Hi Jérôme, try this in your image.ini.append [AliasSettings] ... AliasList[]=smallpic [ImageMagick] ... Filters[]=thumb=-resize 'x%1' -resize '%1x<' -resize 50% Filters[]=centerimg=-gravity center -crop %1x%2+0+0 +repage Filters[]=strip=-strip [smallpic] Reference= Filters[] Filters[]=thumb=200 Filters[]=centerimg=100;100 Filters[]=strip= It's not perfect, but it works: -) First you scale the image twice big as you want to have it in the final result (in that case 200 px) -) Then you resize it to 50% -) Then you crop it The last "strip" strips off exif infos from the image. If you have "normal" pictures it should work. HTH Best wishes, Georg. Best wishes, Georg. -- http://www.schicksal.com Horoskop website which uses eZ Publish since 2004
Jérôme Vieilledent	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
Georg Franz	Thursday 30 August 2007 6:16:28 am Hi Jérôme, install and use ImageMagick, it's better than GD2. Ignore the %1 in the filter settings, it's just a placeholder for the first value from the image ini block. (%2 for the 2nd and so on.) Example image.ini for IM: [ImageMagick] IsEnabled=true ExecutablePath= Executable=convert ExecutableWin32=convert ExecutableUnix=/usr/bin/convert More infos about crop + thumbnails from IM: http://www.imagemagick.org/Usage/crop/ http://www.imagemagick.org/Usage/thumbnails/ Best wishes, Georg. -- http://www.schicksal.com Horoskop website which uses eZ Publish since 2004
Jérôme Vieilledent	Saturday 01 September 2007 7:13:37 am Thank you, I will try :-)
Stéphane Bullier	Sunday 02 September 2007 11:04:14 pm Hi, You can find info here : http://ez.no/download/ez_publish/changelogs/ez_publish_3_3/new_image_system Stéphane
meinhard benn	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. http://goozee.benn.org/ - Google Co-op for eZ sites