Any suggestions on how to "onion skinning"?

[Mark Smith]

I must rather shamefacedly admit that my seemingly clever  
'binaryDecode' method is actually just extracting the red channel --  
so not very clever :(

Best,

Mark

On 3 Dec 2007, at 21:41, BNig wrote:

>
> the timing on a MacBook Pro 2.33 GHz for the scripts is
>
> on average 190 Milliseconds for the whole thing, i.e. passing the  
> original
> file to Colorsyncscripting, creating the grayscale file on disk and  
> reading
> the file into Revolution and display the image.
>
> if you change the applescript so that you keep Colorsyncscripting open
> instead of closing it as the current script does then the whole  
> thing takes
> about 90 Milliseconds. This of course if you intend to do multiple
> conversions. Right now ColorSyncScripting is closed after five  
> seconds, if
> you set the filename of the image and start the conversion within  
> this time
> you get the 90 milliseconds as it is.
>
> It also helps to put into a startup script that starts  
> ColorSyncScripting
> during startUp, somehow it "initialises" applescript and revolution  
> and
> ColorSyncScripting is ready when you do the first conversion.
>
> a script like this would do:
> ------------
> on openStack
> put "tell application " & quote & "ColorSyncScripting" & quote & " to
> launch" into forASVar	
> do forASVar as applescript
> if the result is not empty then answer the result
> end openStack
> ---------------
>
> the timing for the two variants strictly within Revolution to do  
> the same as
> the applescript variant:
>
> Ron Woods: 1080 milliseconds
> Mark Smith 660 milliseconds ( the binarydecode variant)
>
> having set the paintcompression to "RLE" on startup these values  
> change to:
> Ron Woods: 800 milliseconds
> Mark Smith 400 milliseconds ( the binarydecode variant)
>
> just setting the imagedata with the "RLE" startUp
> 22 milliseconds !! brilliant
>
> all measurements made with the same picture 640 by 480 pixels
>
>
> thank you for pointing me to the RLE and PNG problem, I was not  
> aware of
> this. I use set imagedata in correcting movies for shifts, this  
> involves 900
> to 1200 images/movie of 768 by 576 pixels, and the 400 milliseconds  
> it takes
> for each image on an iMac 2 GHz definitely add up. the actual  
> taking apart
> of the image and putting it back together again in Revolution is  
> quite fast
> (about 60 milliseconds). So I will try to set the paintcompression on
> openstack.
>
> BTW I very much like your stacks on imagemanipulation in  
> Revolution, it is
> amazing what you do with them
>
> Thank you.
>
> Bernd
>
>
>
>
>
>
> Wilhelm Sanke wrote:
>>
>>
>> On Mon Dec 3, 2007 BNig niggemann at uni-wh.de wrote:
>>
>>> Ken,
>>>
>>> if you are on MacOSX system > = 10.4 and you just want the image  
>>> to be
>>> grayscale then you can try an applescript for colorsyncscripting.
>>> it is a lot faster than Revolution. It takes Revolution from "set  
>>> the
>>> imagedata of image x to y" for a 640x480 on a MacBook Pro 2.3  
>>> about 280
>>> Milliseconds to display the image. So whatever you do you have this
>>> overhead.
>>
>>
>> You did not tell us in your post how fast using "applescript for
>> colorsynscripting" actually is?
>>
>> Concerning the occurring "overhead" you mention when you display the
>> changed imagedata from a variable in Revolution, like "set the  
>> imagedate
>> of img "x" to changeddata",  you have to take into account which
>> paintcompression is set. PNG can be up to ten times slower than RLE.
>>
>> See bug # 5113 "Slower speed of imagedataprocessing with engines  
>> >2.6.1
>> and PNG compression" with the attached test stack. Curiously, this  
>> bug
>> is still left as "unconfirmed" although we had a discussion about  
>> this
>> on the improve list half a year ago.
>>
>> On my 2 GHz machine to display a 640x480 image from a changed  
>> imagedata
>> variable takes 50 milliseconds with the paintcompression set to  
>> RLE and
>> 580 when set to PNG.
>>
>> The Revolution engine defaults to RLE, but the Rev IDE changes  
>> that to
>> PNG on startup.
>>
>> For fastest imagedata processing use engine 2.6.1 and the Metacard  
>> IDE -
>> or set the paintcompression to RLE on openstack.
>>
>> Regards,
>>
>> Wilhelm Sanke
>> <http://www.sanke.org/MetaMedia>
>>
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>
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