Tek-Tips is the largest IT community on the Internet today!
Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!
-
Congratulations bkrike on being selected by the Tek-Tips community for having the most helpful posts in the forums last week. Way to Go!
count pixels 1
- Thread starter jamesoc
- Start date
-
1
- #2
It depends what you mean by "a specific area".
If you set the PB measurement units to pixels (i.e. set .scalemode = 3), then its fairly straightforward. The properties .scaleheight and .scalewidth give you the height and width respectively of the PB in pixels. If your "specific area" is defined as a function of the total width and total height then just take the appropriate fraction. On the other hand, if your "specific area" is defined by, say, all the pixels whose red component is > 97, then loop through all the pixels in the PB using the .point function and count the ones which meet your criterion.
Note however that that will be a bit slow for lots of big pictures. Using API functions to set and get the bitmap bits associated with the PB is a lot faster.
If you set the PB measurement units to pixels (i.e. set .scalemode = 3), then its fairly straightforward. The properties .scaleheight and .scalewidth give you the height and width respectively of the PB in pixels. If your "specific area" is defined as a function of the total width and total height then just take the appropriate fraction. On the other hand, if your "specific area" is defined by, say, all the pixels whose red component is > 97, then loop through all the pixels in the PB using the .point function and count the ones which meet your criterion.
Note however that that will be a bit slow for lots of big pictures. Using API functions to set and get the bitmap bits associated with the PB is a lot faster.
- Status
Similar threads
- Locked
- Question