[AccessD] OT: photo size on web site

Henry Simpson hsimpson88 at hotmail.com
Tue Jun 3 23:31:15 CDT 2003


Using Photoshop after I complained about the price.  You may try 
manipulating the image data yourself.  The data rows are mod image width in 
pixels times 3 for 24 bit 3 byte color assuming bit map source data.  Things 
get messy when you work with jpegs though.  You can resize by a factor of 2 
(4 in area) by averaging blocks of 4 adjacent pixels with source data.  This 
may be an issue with your camera image data, but the Canon D60 gives me 3072 
by 2048 pixels that can be acquired as raw data.  Scaling by a factor such 
as 99% yeilds a visible degradation of print quality in edge sharpness.  If 
you ever work with raw data you'll get a better understanding of what 
programs like Photoshop can do for you and how to work with the program 
rather than against it.

A reasonable solution, though without batch capabilities, is to use the 
freebie that came with Office 97 - Microsoft Photo Editor.  With an open 
file, from the image menu, choose resize and then choose a nice integral 
factor like 25% so as not to compromise image clarity unnecessarily and 
then, from the File Save As menu, hit the More button and select what they 
call an image quality factor which is more accurately a compression ratio.  
As you already have discovered, the image size is independent of the browser 
display size and you need to balance image pixel size and jpeg compression 
for a reasonable file size and clarity suitable for web usage.

Hen

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