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Using PIL
Using the Python Imaging Library to scale images on-the-fly
This tutorial will teach you how to create content types the Plone 2.1 way, using the ATContentTypes library, by following the example of RichDocument, an extension of Plone's standard Page/Document type.
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The Python Imaging Library, PIL, is capable of (among other things) re-scaling images on-the-fly. The Archetypes ImageField can take a sizes attribute to define the possible sizes an image can be scaled to. ATContentTypes defines the following sizes in 'ATContentTypes/content/image.py':
sizes= {'large' : (768, 768),
'preview' : (400, 400),
'mini' : (200, 200),
'thumb' : (128, 128),
'tile' : (64, 64),
'icon' : (32, 32),
'listing' : (16, 16),
}
These can then be referred to by name. For example, to render the thumbnails in the richdocument_view_preview template, we do:
<img tal:replace="structure python:image.tag(scale='thumb')"/>
where image is an ImageAttachment object.
by
Martin Aspeli
—
last modified
September 5, 2005 - 10:59
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