Flash retains existing .JPEG compression levels on any imported .JPEG image, but, unless specified otherwise in the Library, it reapplies .JPEG compression when the movie is published or exported. Recompressing an image that has already been compressed usually leads to serious image degradation, due to the introduction of further compression artifacts. When importing .JPEGs (and other bitmaps), you’ll note that Use document default quality in the Library is checked by default. This is a feature, not an annoyance. That’s because (a) Flash has a relatively generic .JPEG compression engine, which is easily surpassed by both Fireworks and Photoshop, and because (b) as mentioned previously, recompressing a .JPEG is routinely disastrous to image quality.
Apply compression settings to each individual bitmap in the Flash Library to determine the quality that you need before you use the general .JPEG settings in the Export Movie or Publish Settings dialog.
There is a known problem in Flash that’s referred to as bitmap shift, which means that colors may shift slightly from one instance to another of the same image. This has been attributed to several reasons. Some developers have reported that turning off compression has, at times, eliminated problems with bitmap shift. Another reported method for eliminating bitmap shift is to make the image a symbol, and then assign it an alpha of 99 percent. Yet the clearest explanation, and related fix, are as follows: Flash renders a bitmap while animating or transforming it, and then rerenders the bitmap as a static image when the motion or transformation ceases.
Often, the two don’t quite match. From this perspective, the optimal solution is to set the final bitmap’s scaling to 99 percent. The advantage of this solution (aside from the fact that it works) is that it’s less processor intensive, because any alpha adjustment burdens the processor with computations.
We’ve received more than a few queries about image formats and Flash’s capability to transcend issues of browser inconsistency, so here’s the answer. Many image formats, such as .PNG, are not supported across all browsers. When you import such an image format into Flash and publish or export to the .SWF format, you have accomplished browser independence because the .SWF is browser independent and because the image has been encapsulated within the .SWF format. (The image is not being sent to the browser in the imported format and then magically empowered to display.) Conversely, if you export any .FLA to .PNG or to any other format that’s subject to cross-browser inconsistency, browser independence is lost.
Flash Related Interview Questions
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Understanding The Flash Framework
Exploring The Interface: Panels, Settings, And More
Using Tools For Navigation And Viewing
Working With Selections And The Pen Tool
Working With The Drawing And Painting Tools
Working With Text
Exploring The Timeline
Checking Out The Library: Symbols And Instances
Drawing In Flash
Animating In Flash
Using Bitmaps And Other Media With Flash
Designing Interfaces And Interface Elements
Understanding Sound For Flash
Importing And Editing Sounds In Flash
Optimizing Flash Sound For Export
Understanding Actions And Event Handlers
Navigating Flash Timelines
Controlling Movie Clips
Sharing And Loading Assets
Planning Code Structures
Creating Subroutines And Manipulating Data
Understanding Movie Clips As Complex Objects
Sending Data In And Out Of Flash
Understanding Html And Text Field Functions In Flash
What Is Generator?
Revving Up Generator
Working With Third-party, Server-side Applications
Working With Raster Graphics
Working With Vector Graphics
Working With Audio Applications
Working With 3d Graphics
Working With Quicktime
Working With Realplayer
Creating Full-motion Video With Flash
Creating Cartoon Animation With Flash
Planning Flash Production With Flowcharting Software
Working With Authoring Applications
Publishing Flash Movies
Integrating Flash Content With Html
Using Players, Projectors, And Screensaver Utilities
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