Re: FLASH: JPEG quality poor regardless of settings?

[peter hagerty]

At 08:18 PM 5/18/00 -0400, Laura Mollett wrote:

>On the other hand, I don't know why it would appear better quality in a

>smaller swf. There was a thread on the list awhile back about adding even

>one frame causing image quality deterioration, but I don't remember it

>clearly enough to know if this could be the same issue, so maybe someone

>else can help more :)

>Laura


Hi Laura

I recovered this post from Matt Wobensmith 4/7/00

He specifically refers to bitmaps (not jpegs?).

I guess this is why... "Director deals better with bitmaps"(J.Dowdell)


Issue: 

Adding more than one frame to a movie causes the image quality to deteriorate.


Reason: 

Bitmaps in one-frame movies are actually treated differently than when

given more frames. Why? To display a bitmap at its highest quality,

playback speed may be compromised if it's expected to maintain the same

quality. Therefore, when the movie has more than one frame, image quality

is automatically sacrificed for the sake of performance. It's a case of

quality vs frame rate. 


This is how the program is built. We can't necessarily override this feature.


However, I should also add that the quality of bitmaps in movies with more

than one frame shouldn't deteriorate *that* badly. 


If you find that image quality is unnacceptable, try these things:


1. Set the image quality to "Best" in the Publish Settings. This setting

specifically optimizes bitmaps when played back in the browser.


2. Change the compression settings in the Library > Bitmap Properties.


3. Try resizing the image by 1%. Oddly enough, sometimes Flash can be

quirky when rendering bitmaps (shifting, banding, etc) and it can be

corrected by doing something minor such as adjusting size or alpha, ever so

slightly.


4. Bring the image in again in a different format.


HTH -


Matt


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

Matt Wobensmith

Macromedia Tech Support

Flash Team Lead



original edited text below:


>I've imported 6, high grade PNG images into Flash. 

>Placed them all in their own layers on the FIRST keyframe. 


      <snip>


>If I place them on the FIRST keyframe of the movie and DO NOT add any other

>frames, keyframes or scenes, they look as good as the original image file.


      <snip>


>If I add, even an empty frame, keyframe or scene anywhere in the FLA file,

>those same images show an incredible amount of degeneration. 


      <snip>


>Please assist. Is this a bug in Flash ?




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	  May/June 2000

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:: peterhagerty


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