Re: FLASH: Has anyone else noticed this about images on flash?

[John Croteau]

Hi Samir,


> 1.   I noticed something quite peculiar on flash yesterday and went

> ahead to proving it so for all image compression proggies. On a pre

> compressed image (say from ulead smart saver) the image size is larger

> after compression on flash than a non compressed version of the

> same.....

> 2.  On a pre compressed image from Photoshop, smartsaver compresed

> image size is larger than if the image was set at full quality from

> the beginning...

> 3. Overall, the image has a poorer quality if I used the compressed

> one than using the original......

This is something I say on a regular basis. Do not import images into

Flash in jpg format. JPEG is a lossy format and always distorts the

image while compressing it. The more compressed a jpeg picture is the

more small artifacts are created. You should never recompress a picture

that was compressed previously with a compreesed format such as jpg.

This is especially true for Flash. The best jpeg compression is almost

always made from the original and not by recompressing a previously

compressed jpeg.


Usr bmp or pict formats for saving images while processing images to be

imported into Flash, and then import into Flash as a bmp or pict file.


The amount of reduction in file size made by jpg compression makes no

difference on the size of the working file of the image inside Flash.

And when exported by Flash to the swf file the artifacts created in jpg

compression will likely create a larger file size in the swf file.


> (By the way, this does not happen with PNG sor GIFs!)

> Just thought u would like to know.........

These are not lossy formats. Gif has a maximum color set of 256 colors

si images that use more than 256 colors will be changed when saving to

GIF to limit the colors to a palette of a maximum of 256 colors. GIF

should not be generally used as a working format when you plan to print

to paper or for other uses such as TV where you don't want to limit your

picture quality to save bytes.


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

John Croteau

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

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