Re: Virtual Iris Show

Ken,

When you say your JPEGs are less that 10MB, do you mean the size of the JPEG 
fuel or the size when the JPEG is opened and decompressed.

JPEG is a "lossy" compression algorithm and the amount of compression affects 
the quality of the resorted image. The higher the compression the smaller the 
resulting file and the lower quality the compressed image.

John

On Feb 24, 2014, at 7:52 PM, Kenneth Walker <kenww@astound.net> wrote:

> 
> Hi Bob,
> 
> A couple points of image size:
> 
> I have a high resolution camera and JPEGs are typically less then 10MB. Did 
> you mean 10,000KB (same as 10MB) for a max file size rather than 10,000MB? 
> "K" vs "M" makes a big difference.
> 
> The size of a digital image is measures in pixels of width and pixels of 
> height. Dots per inch is a display or print resolution. If you'll excuse an 
> analogy, it's a bit like asking for gas and telling me your car uses 3 
> ounces per mile. I can't tell how much gas you need without knowing how far 
> you are driving. I don't know how many pixels you'd like without knowing 
> how big you might print the picture. This is why Photoshop puts resolution 
> together with size in inches (or cm, etc) under the grouping of "Document 
> Size"; when you print, you can't have one without the other.
> 
> As a photographer it is easier for me if you decide on a range of 
> reasonable pixels sizes. 
>       • Suppose you want all photos capable of being printed with a size of 
> 3 inches at 300 pixels per inch. 3 inches * 300 pixels per inch = 900 
> pixels, or 900 by 900 pixels for a square photo.
>       • Or maybe you expect your judges to use monitors at least 1200 
> pixels high. You might request that pictures be at least 1200 by 1200 
> pixels.
>       • Maybe you'd like the option to print some of the pictures across 
> the cover of the AIS bulletin at a high resolution: 12.5 inches * 600 
> pixels per inch = 7500 pixels (although cameras for that size image cost 
> tens of thousands of dollars; probably excessive for this contest).
> Perhaps it would be reasonable to have something on the How to Enter page 
> like "Images sizes should ideally be between 1200 by 1200 pixels and 3500 
> by 3500 pixels". Or whatever range seems good to you.
> 
> Ken
> 
> 
> 
> 



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