Bitmap Ignores Parent Symbol's Transformation During Tween Bug/Glitch

[DigitalDesignDude]

Hello,

I've run into a potential glitch or bug where my classic tweened symbol containing bitmaps doesn't distort the bitmaps as expected for a few frames during a skewing animation. Instead, the bitmaps defy the parent symbol's distortion as if they remove all transformations for a few frames, thus causing an undesired visual inconsistency/error in the animation.

Below is an example video showing the issue and further explaining it while attempting to create a simple animation of a book's page being turned. 
https://youtu.be/3SnOcTJSCcs

The issue is not present when the bitmaps are converted into vector art using Adobe Animate's Image Tracing feature. So I wonder if there's anything else I could do to prevent the issue from happening with bitmaps since I wish to use more detailed photos as part of some future animations. 

Thank you in advance for any input or workarounds. 

[n. tilcheff]

Hi mate, 

Just to add: I tested with a simple bitmap on the stage, without containers or tweens.

The moment you 'squash' below 2% the glitch appears. 

This is from Flash CS6, so it must be a long-standing issue:

Maybe you can work around the issue by giving your page turn tween an ease in and out, so that the amplitudes between frames in the middle are larger.

[Firewood：D]

This is almost an unavoidable problem with bitmap rendering,
But there is a way to avoid it.
Convert the bitmap into a movie clip, open the 3D rotation tool, select the minimum perspective angle and Z axis in the properties (for example, 1; 2), and then convert the symbol converted into a movie clip into a graphic component, and the next step can be performed .
I tried it and it was perfect!

[DigitalDesignDude]

Thanks all for your suggestions and verifying the problem doesn't only happen to me!

Inspired by @Firewood：D 's solution, I found another way to solve the problem by storing the bitmaps within MovieClip Symbols and setting their Render Setting to be "Cache as Bitmap".

Below is a follow-up video to my previous one demonstrating the fix and I hope it helps anyone else who needs it 🙂
https://www.youtube.com/watch?v=LJT-L4efKiQ

[Firewood：D]

Wow! Great! I also learned

[n. tilcheff]

Well done!

🙂

[kqskcm]

my method
Add Adjust color to the picture inside the symbol