Re: FLASH: Image quality

[John Croteau]

Hi Gary,


> I'm not quite sure what you mean by the below statement...

> >Compressing pictures with jpeg make them

> >less suitable for further compression with jpg. Use uncompressed formats

> >such as bmp or pict before making the final version in jpg whether it is

> >for Flash or otherwise.


> If I have an image that is already in jpg format, are you saying that I

> should open that image up in a Graphics program, and do a FILE|Save As| and

> select the .bmp, or .pic option?

The point is you should never save it as jpeg. If the original was not a

jpeg it would normally be a lot better to go back to that and save it in

a non-lossy format (i.e. not jpeg). 


If the original is a jpeg don't further reduce it's quality by saving it

as a jpeg while you are working on it. JPEG is not a working format, it

is a transmission format not meant to be applied more than once.


Jpeg compression always causes loss of information from the original

picture and it always does it by an algorythm that actually displays

added fine details (dithered dots) that were not in the original. This

generally makes compressing the image a second time less efficient. 


Look at sharp edges of a font character saved as a gif, then look at it

after it is compressed with JPEG and see how the jpeg's image's edges

are dithered and look anti=aliased and are smoother than in the

original. Because of this smoothing, text looks better in gifs (or of

course Flash) where as real photographical pixs will often look fine

when smoothed by jpeg. 


-----------                               -----------------------

John Croteau

croteauerols [dot] com (mailto:croteauerols [dot] com)

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