On Wednesday, June 18, 2003, at 07:04 PM, Rob Ross wrote:
DPI.I want to be able to draw a simple square with a given width/height in pixels, filled with a solid color given by a RGB value, rendered at 150
1) create a new image object 2) get the graphics of the object 3) draw my square in my color 4) convert the image into a JPEG with the right parameters (especially the DPI) 5) save it to a file.
Ok I have figured out how to do steps 1-3. But I don't know if I have to do something special when I draw into the Graphics2D so that later when I save it as a JPEG, I can get my resolution of 150 DPI, which is more than the standard ~72 DPI of a screen-drawn image.
So, say I have drawn a 100x100 pixel blue square in my Graphics (at 72 DPI)...how do I turn it into a JPEG at 150 DPI?
I don't have a complete answer for you, but I might be able to point you in the right direction.
You could use the Image I/O api (javax.imageio), which is included in JDK 1.4+. It provides reading and writing facilities for images. This includes file metadata, like resolution. It appears that the plugin-independent metadata model includes resolution in Dimension/HorizontalPixelSize and Dimension/VerticalPixelSize.
http://java.sun.com/j2se/1.4.1/docs/api/javax/imageio/metadata/package- summary.html
I've never done this myself, so I can't vouch that it works. But there you go.
Rhett
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