Image system: incorrect behaviour or my mistake?

Thursday 10 May 2007 4:43:04 am

Let' assume i have 2 pictures:
Picture1: 500px*375px
Picture2: is resized Picture1 (200px*150px) saved in a photo editor without(!) compression.
Both pictures have maximal quality.

Then I upload both pictures to Exponential.
My image.ini.override:

[MIMETypeSettings]
Quality[]=image/jpeg;75

[GD]
IsEnabled=false

[ImageMagick]
IsEnabled=true

[small]
Filters[]
Filters[]=geometry/scalewidthdownonly=100

Now i have:
'small' variation of Picture1 is about 25KB
'small' variation of Picture2 is about 5KB

Both 'small' variations are almost identical - pixel-to-pixel, but size differs drastically.

I can't understand it: i tried to resize both pictures in adobe photoshop with q=75 and size=100px*75px and result pictures have same size.

What's going on? Is it incorrect resizing in ImageMagick or my mistake in settings?

Friday 11 May 2007 3:46:10 am

Hi Andre

One thing you may want to check is if both the orginal images have EXIF information. One senario is that Picture 1 does have it and Picture 2 doesn't, possibly stripped by the photo editor. If it is present it can actually take up more bytes than the image on smaler images.

See: http://suffandnonsense.blogspot.com/2006/04/reduce-thumbnail-size-in-ez-publish-by.html
for more info.

Cheers
Bruce

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