Export Snapshot question

[Dave]

On 16 Mar 2007, at 17:12, Scott Rossi wrote:

> Recently, Dave wrote:
>
>> I need to export a snapshot in a non-compressed format, from looking
>> at the documentation I can export in the following formats:
>>
>> JPEG
>> GIF
>> PNG
>> PBM
>> PGM
>> PPM
>>
>> JPEG is no good for what I want since it is lossy. GIF is no good
>> because it only supports 8 bit color and I need 24 bit (if not 32 bit
>> with Alpha Channel) I'm not sure what PBM, PGM or PPM are?
>
> I believe these are formats for Unix but someone else may know better.
>
>> Which
>> leaves PNG which uses lossless compression, however what are the
>> defaults for the image? (Pixel Size, Component Size etc.).
>
> Not sure what you mean by 'defaults' but if you have a 400 x 300  
> image, it
> will export with those dimensions at (I believe) the native display
> resolution.  I don't believe there are any configurable settings  
> for PNG.
>
> Also, you may not want to rule out JPEG.  Depending on what your  
> app does, a
> JPEG image with minimum compression (JPEGQuality = 100) should have  
> very
> minimal loss.  If you need alpha channel support, however, PNG is  
> your only
> option.
>
> Regards,

Thanks Scott, this for TV broadcast equipment and 100% cannot have  
any loss of data. For the PNG option I meant what is the Pixel Size  
for the PNG file? 8 Bit, 24 Bit or 32 Bit? The documentation says it  
will output an alpha channel but I not sure how it decides to do this?

All the Best
Dave