Imagemagick resize option with caret (^)

Saturday 17 May 2008 2:25:22 am

I'm trying to use imagemagick's resize option with minimum image size limit parameter, which is a caret (^). Unfortunately, it fails. Here's an example:

Filters[]
Filters[]=square=-resize %1x%2^ -crop %3x%4+0+0 -gravity center

Something wrong with that filter, eZ Publish, or maybe the library itself? The result is:

Failed executing... Error code: 1

Thanks,
Piotrek

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Sunday 18 May 2008 1:08:32 am

Hey Bartek,

Thanks for the tip - I keep forgetting the differences between gd and imagemagick ;)

So, the thing was not an error, but a version problem - this caret option is a relatively new solution (which by the way is totally curious to me... so many years without a basic geometry setting...). None of my version supports that, so I found another filter trick:

Filters[]=squarefix=-resize x%1 -resize '%1x<' -resize 50% -gravity center -crop %2x%3+0+0 +repage

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Monday 28 July 2008 8:53:52 am

Hi,

I found that instruction as one of the possible workarounds of the caret problem, somewhere in a IM forum. It is supposed to scale down, down to the smaller picture size, and it uses some resize to read image sizes (as far as I remember, IM had some inconveniency about reading that). Unfortunately, I won't be able to decode that word by word - I'm IM beginner ;)
Oh, and that one in particular is used for square images only, I think.

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Tuesday 09 September 2008 9:22:21 pm

Those espressos must have been black as hell! ;)

Yes, this method sometimes produced blury results, but that it mostly limited to a situation where the source image is relatively small. Otherwise, seems to work fine for me.

And yes, you may differ this about resizing order and size, depending on whether you expect more horizontal or vertical images, for better results. In my case, I wanted rectangular images, and decided not to pay much attention to that problem since there was no way of telling that.

It's surprising that all key, and apparently basic functionalities, have been introduced so recently... (speaking the caret)...

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