Comments on: Bilinear Resampling, ShaderJob, Pixel Bender And Flash Player

By: Will

Will — Tue, 18 Oct 2011 04:25:44 +0000

Thanks for this! I’ve tried the other bilinear options people have put out there, Lanczoz and the normal bicubic methods and this by far for my purpose produces the best results and works at a decent speed. Maybe you think you wasted your time with a pb bicubic resampler but I would still very much like to give it a test run, because even though you can do it with smoothing, the image still can be different, which I would like to see.

By: Boris

Boris — Tue, 10 May 2011 12:50:58 +0000

Super fast!! On AIR for Android. Thank you!!!

By: r

Mon, 04 Oct 2010 23:19:44 +0000

speaking of `reinventing the wheel`… isn’t this basically the same thing as when you right click your image in the library and select “Allow Smoothing”?

and for dynamically loaded images, you can load allow smoothing as well

or am i missing something in here?

By: Goran

Goran — Thu, 26 Aug 2010 08:32:26 +0000

Great post. tnx:)

By: dubbeat

dubbeat — Fri, 02 Jul 2010 09:06:34 +0000

legend. thanks

By: Yoz

Yoz — Sat, 16 Jan 2010 14:40:53 +0000

Hi, I have just figured out smoother downscaling
http://blog.yoz.sk/2010/01/how-to-resize-an-image-with-actionscript/

By: How to resize an image with ActionScript at Jozef Chú?ka's blog

How to resize an image with ActionScript at Jozef Chú?ka's blog — Wed, 13 Jan 2010 21:25:51 +0000

[...] If you are looking for transformation between BitmapData, Bitmap, ByteArray, read this article. Continue reading about Bilinear Resampling, ShaderJob, Pixel Bender And Flash Player. [...]

By: Andy Li

Andy Li — Mon, 24 Aug 2009 23:46:36 +0000

I’ve just made bicubic resampling in Pixel Bender:) See it at http://blog.onthewings.net/2009/08/25/bicubic-resampling-by-pixel-bender/

By: bjorn

bjorn — Fri, 31 Jul 2009 23:10:42 +0000

the best fix is stageQualiy = best

By: Jeff

Jeff — Fri, 31 Jul 2009 22:33:14 +0000

I found that taking a larger picture and dividing the width and height by 4 gave me jaggy edges yet if I first divided width and height by 2, then used that image and divided width and height by 2 again this was much cleaner. Would bicubic resampling solve this problem? Any eta when adobe might make that option available?

By: High quality, high performance thumbnails in Flash - Jacob Wright – Flex, AIR, PHP, etc.

Fri, 17 Jul 2009 19:37:10 +0000

[...] some more searching I found that Brooks Andrus played with some algorithms using Pixel Bender. The conclusion to that was he found he could do the same thing with the “smoothing” option in the [...]

By: Bjorn

Bjorn — Wed, 01 Jul 2009 23:32:59 +0000

Hi Brooks,

It seems Flash wont apply smoothing when scaling large images to smaller bitmapDatas.

So far you’re solution is the only one i’ve found.

thanks

By: Erik

Erik — Thu, 23 Apr 2009 15:42:53 +0000

Do you know what scaling function is used for bitmapdata.draw with and without smooth?

By: Brooks

Brooks — Thu, 02 Apr 2009 19:52:36 +0000

@Erik – I’ve looked but haven’t seen anything that will do bicubic sampling. The limitations on PBK code for Flash Player might make it hard to to pull that off. I did read somewhere that the PixelBender team was considering adding different sampling techniques in the future–hopefully they do.

By: Erik

Erik — Thu, 02 Apr 2009 19:17:03 +0000

Heh.. the path information had nothing to do with my problems (environment issues were the culprit). That annoyance aside, I am wondering if you’ve come across an implementation of bicubic sampling for pixel bender? Thanks for introducing me to pixel bender!

By: Erik

Erik — Wed, 01 Apr 2009 23:27:45 +0000

Ah, I see. I changed the package to “test” and the pbj/pbk’s have their path’s coded in.

By: Erik

Erik — Wed, 01 Apr 2009 23:19:53 +0000

Trying to run your code to test drive, but get

Error: Type was not found or was not a compile-time constant: BilinearScaling.

Snagging on this line:
shader.byteCode = new BilinearScaling();

Any suggestions? (I am able to link to the pbj file, btw, so I don’t think that is the error).

By: localToGlobal » Blog Archive » news review -> 11th week of 2009

localToGlobal » Blog Archive » news review -> 11th week of 2009 — Fri, 13 Mar 2009 17:01:07 +0000

[...] > Bilinear Resampling With Flash Player and Pixel Bender [...]

By: Brooks

Brooks — Thu, 12 Mar 2009 17:25:21 +0000

@felix – hmm…yah, you can. You actually have to create a temp bitmap at input dimensions, do a bitmap.draw() on your bitmap, then create another bitmap at output dimensions and do a bitmap.draw() with smoothing turned on and a Matrix that contains your scale.

I thought I had read out on the web that smoothing didn’t work when the image was downsampled, but after your comment I double checked and it seems to do a decent job (initially when I tested I was turning smoothing and using a DisplayObject as the source which won’t work. You need to create the temp bitmap first).

The only consolation I can give anyone is this post gives a nice example of how to use a Pixel Bender shader with a ShaderJob, rather than just applying it as a filter.

By: felix

felix — Thu, 12 Mar 2009 16:45:28 +0000

Can’t you use Bitmapdata.draw() with smoothing turned on to achieve the same thing?