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Should I crop images before editing them in AE to render fast?

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Yousuke Kitaoka
Should I crop images before editing them in AE to render fast?
on Jan 30, 2013 at 3:48:55 am

Hello. I am using AE CS6 win version.
Right now, I am editing my animation in AE. I made the animation in photoshop using its timeline, and I rendered all images as a PNG image sequence with alpha channel. Size of the sequence is 1000 x 1000 pixel. And I imported those PNGs into AE, and put them into 500 x 500 pixel compositon.

And I have a question, should I crop PNG images to 500 x 500 pixel before importing them into AE? I checked file size of those PNG files, and non-cropped single 1000x1000 pixel PNG is 15 KB, but cropped single 500x500 pixel PNG is 7 KB. It's a big difference.

I thought I don't need to crop my image, because I put them into 500 x 500 pixel composition, it means AE won't render all area of those PNGs, and those PNG images are covered with transparent areas, like a PNG file below.(I uploaded this image to explain my situation, but I am not editing it. I am editing hand drawing images.)
Though I don't render all area, pixel size and Alpha data of PNGs has some effect on rendering time in AE? If so, I should have cropped...
Please tell me what is the best choice to render fast in AE while editing. Thank you in advance.


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Vishesh Arora
Re: Should I crop images before editing them in AE to render fast?
on Jan 30, 2013 at 7:18:13 am

Yousuke

those PNG images are covered with transparent areas, like a PNG file below.


The PNG that you have uploaded does not contain the Alpha Channel.

I would suggest you to import the PNG sequence in AE , put that sequence in 500 x 500 comp and Pre-Render it and then Work on the effects part.

Vishesh Arora
3D and Motion Graphics Artist
Films Rajendra

Blog:
http://digieffects.wordpress.com

2011 3D Demo Reel:








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Tudor "Ted" Jelescu
Re: Should I crop images before editing them in AE to render fast?
on Jan 30, 2013 at 10:23:18 am

I would crop only if I knew that I do not want to change things later (re-size or move). Vishesh suggested a method or you can do it in PSD. However, at the size you are working with it will not make that much of a difference in AE on a decent machine. You will notice a difference at larger sizes (for example if you crop a 4k image to HD...)

Tudor "Ted" Jelescu
Senior VFX Artist


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Yousuke Kitaoka
Re: Should I crop images before editing them in AE to render fast?
on Jan 31, 2013 at 9:17:05 am

Thank you for your reply guys. That PNG has no alpha? Sorry.
If there is no difference in rendering time, I won't crop it.


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Vishesh Arora
Re: Should I crop images before editing them in AE to render fast?
on Jan 31, 2013 at 9:18:49 am

Glad to help

Vishesh Arora
3D and Motion Graphics Artist
Films Rajendra

Blog:
http://digieffects.wordpress.com

2011 3D Demo Reel:








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