When to resize user uploaded images
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Alexander Obuhovich
Feb 29, 2012, 8:58:16 AM2/29/12
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It's obvious, that users upload images in a higher resolution, then actually is needed on a website and they needs to be resized.
Right now to speed up uploading process In-Portal don't resize image right after uploading, but only at time, when it's displayed in a different resolution on a website.
This seems to be very good solution when:
- small amount of users tries to view a page with image thumbnails displayed;
- images were originally uploaded in low resolution (smaller then 1MB on size).
But in case when a lot of users tries to see page with resized images at a same time and original images are ~4MB+ in size, then it will take a lot of memory and will attempt to resize same image multiple times.
In-Portal don't pre-resize images in background, because it can't guess what image dimensions would be requested in actual theme, user set's as primary.
But I have an idea, how to overcome that:
Create new column in Theme table, called ImageResizeRules, where per-path image resize rules will be written in following format:
- /system/path/one/:format1
- /system/path/two/:format2
Usually each line would look something like this:
/system/images/manufacturers/:resize:100x75;default:img/no_picture.gif
Actual data to place in ImageResizeRules field of the theme database table will be retrieved from <image_resize_rules> node in /_install/theme.xml file of individual theme.
Then CRON script would scan all rules from each theme and pre-resize images according to them.
Even more, if we would consider using Message Queuing servers, like ZeroMQ, then we could schedule resize jobs right after image was uploaded.
Alexander Obuhovich
Jul 8, 2012, 4:49:08 AM7/8/12
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After discussing with Dmitry shorty after posting we agreed to create "Settings" field (textarea) in each Agents/Scheduled Task. In context of this discussion this field can be used for specification of image resize settings described in original post.
Alexander Obuhovich
Jul 10, 2012, 3:03:41 PM7/10/12
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