[GM-help] Image annotating

[Mark M <mar...@ya...>]

I want to have the mouse on a web browser allow a user to free hand draw
using different colors and pen thicknesses over an existing image and place
text (through a text insert cursor) on the same image. The text could be of
different fonts, colors and sizes also.  I want a person to be able to
annotate an image. I would like to use GraphicsMagick (under Linux) to
overlay this text and drawing over the image using its ability to annotate. 

In looking over the FAQs and documentation, I think the way to do that is to
use the -draw command and use point (or line) and text primitives to do the
job. I could see where this could get into thousands of points potentially.
Will that overload the command line or cause any noticeable slowdown in
processing if I have thousands of primitives?  Is there an XML way do to
same thing where all the annotation information could be put in an XML file?


It appears I need to use -font to set the text font name, do I use
-foreground or -fill to set the text and pen colors?  Could I use the -file
command to save out an overlay differential to prevent reprocessing every
time I display.  

My intentions are not to modify the original image, but to process the
annotations in real time, that way they could be toggled on or off without
having to store both versions of the file.