W3C home > Mailing lists > Public > png-group@w3.org > August 2010

new chunks

From: P L Charles Fischer <cfischer@modernferrotype.com>
Date: Mon, 02 Aug 2010 10:50:22 -0400
Message-ID: <4C56DB2E.9000502@modernferrotype.com>
To: png-group@w3.org
Dear PNG-Group;

I have need for a couple of new or private chunks for PNG image files 
that I think would be useful to the general public and I do not want to 
reinvent them if not necessary.  The following descriptions are not 
detailed enough to define a new chuck.  I only want to know if others 
have suggested the same or similar chunks.  If there are  similar chunks 
proposed I would like to use them.

The first would be a chunk to tell the display program if the original 
image was from a Bayer pattern sensor and if so the color order of the 
sensor and if the original Bayer image can be retrieved from the RGB 
values.  This would allow an editor to change the Bayer interpolation.  
This would not be a critical chunk.  This chunk would only be used in 
RGB or RGBA images.  There would be only one of these chunks per image.  
If no chuck that has the same or similar purpose has been proposed I 
would suggest naming the chunk "baYR".

The second chunk would be to define a few simple drawing overlay 
objects.  The objects would be something like line, poly lines, box, 
oval and maybe text.  Attributes would be line thickness, line color and 
fill color.  The colors would have to match the image type.  There could 
be many of these chunks per image.  If no chuck that has the same or 
similar purpose has been proposed I would suggest naming the chunk "drAW".

Thank you for your time,
Charles Fischer

Modern Ferrotype
8100 Lair Ct.
Chapel Hill, NC  27516
USA
Phone: (919) 360-8687
Received on Monday, 2 August 2010 15:27:34 GMT

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