Re: FLASH: OT: bmp image scaling

[John Croteau]

Hi Laura,


> > How are you supposed to scale something with bitmaps?

> > They get ugly.

This is definately a possibility.


> Recently someone (Burt and I'm sorry I've lost his last name somehow) on the

> hwg-techniques list put up a page with graphics that scale without too much

> quality loss (there is still some) by allowing the browser to resize the

> image (using %s in the width tag).

Bitmaps unlike vectors do NOT scale well. The problem is compound by

computer and browser differences. Bitmaps are created and optimized to

display at a certain size. At their natural size they will display the

best. Bitmaps in gif, png, jpeg whether inside Flash or not will behave

and look their best when displayed at their natural size. Checking how a

bitmap scales on an individual computer is kind of irrelevant since that

is just one case in thousands. Also, some bitmap pictures scale better

than others and a pixel or two in the scale can make a lot of

difference. Bitmaps in Flash often scale better than individual gifs and

jpegs but this is not always the case.


> The trick seems to have been to provide a

> width percentage but not height, keeping the proportions the same but

> allowing scaling. 

Keeping porportions the same is not a trick but a requirement. If scale

doesn't work out evenly, it may be better to use only one parameter but

this may slow down displaying the graphic in some cases.

If this trick allows better overall web display of bitmaps by allowing

browsers to calculate the height it has nothing to do with bitmaps in

Flash. I expect that this 'trick' has the value I have been placing on

it and it is better than scaling using numbers are not at the exact same

ratio.


A picture should scale well from 200x400 to 100x200.

But if you need to reduce 177x231 by half there is no exact pixel

numbers. You have to be off.


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

John Croteau

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

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