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Precise bitmaps

  • To: mathgroup at smc.vnet.net
  • Subject: [mg96689] Precise bitmaps
  • From: "Diamond, Mark" <dot at dot.dot>
  • Date: Sat, 21 Feb 2009 19:37:11 -0500 (EST)

A question was asked back in 2005 about precise bitmaps. I have a similar 
question with regard to Mathematica version 7.

Looking at the new image-manipulation functions in V7, I expected this to be 
quick ... I'd like to be able to create a series of stimuli for use in an 
experiment. The first step in creating the stimuli is to create a 512 x 512 
greyscale image with a white background and which contains the drawn 
objects.

I tried the following to create a JPEG image with dimensions 128x128 ...

circ=Graphics[Circle[{0,0},62]]
rasterCirc=Rasterize[circ,RasterSize->{128,128}]
Export["circle.jpg",rasterCirc]

but instead the image dimensions are 360 x 363 pixels. I had also hoped that 
I could obtain an antialiased arc but the only antialiasing option seems to 
be for Style, which then produces a non-Graphics object.

Can anyone see a simple (i.e., not very low-level programming) solution to 
the problem within Mathematica? What have I missed conceptually that would 
explain the 360x363 pixel dimensions instead of my expected 128x128? And is 
there a way to obtain the anti-aliased circle?

Cheers,

Mark Diamond




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