Converting a PicHandle to format for use with imageData

[Trevor DeVore]

On Dec 29, 2003, at 1:57 PM, Dar Scott wrote:
> On Monday, December 29, 2003, at 12:30 PM, Trevor DeVore wrote:
>
>> This is fairly new territory for me so I'm not quite sure how you  
>> would copy the PixMap of the GWorld to the imageData of the image  
>> object.
>
> I'm no expert either.
>
> Here is the PixMap data:
>
>     
> http://developer.apple.com/documentation/QuickTime/APIREF/SOURCESIV/ 
> pixmap.htm#//apple_ref/c/tag/PixMap
>
> I would guess you would use that info to calculate the rectangle  
> property and that & the associated bitmap (and maybe color table) to  
> calculate the imageData property of the image.  (I'm guessing that  
> maskData and alphaData would not need to be set.)
>
> The imageData is described in the Transcript Dictionary.
> However...  I have used 'export snapshot' to put a snapshot into a  
> variable as PNG and then stuffed that value into the text property of  
> an image.  I don't know if the value put into the variable is exactly  
> PNG, but I suspect it might be.  It might be that PNG is the only type  
> that the text property can be set to, but I think it worth trying  
> others such as JPEG.  So, if you can create a ram image of some file  
> format, your external might return that and maybe that will work as  
> the text property of an image.  The experimenting might be worth it if  
> the above conversion is to be avoided.

> (Caveat:  Some of my image code broke in a recent Rev version.  I'm  
> not sure if it is export snapshot, buffering properties, lock/unlock  
> screen or what, so watch out.)

Hmm, It looks like I am going to have to read up a bit more before I  
tackle this but thanks for the resources.

> Hmmm.  Can you move to that frame and then export snapshot?  Or is  
> that too ugly?

The intended use is to create a thumbnail view of movies on disk rather  
than loading the movie into a player which is too slow apparently.


-- 
Trevor DeVore
Blue Mango Multimedia
trevor at mangomultimedia.com