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Re: Image[], Graphics[Raster[]]

  • To: mathgroup at smc.vnet.net
  • Subject: [mg100296] Re: [mg100270] Image[], Graphics[Raster[]]
  • From: "David Park" <djmpark at comcast.net>
  • Date: Sun, 31 May 2009 06:35:19 -0400 (EDT)
  • References: <6147782.1243412890107.JavaMail.root@n11> <200905280829.EAA14200@smc.vnet.net> <1619090.1243671892104.JavaMail.root@n11>

You can use Image, ImageData and ArrayPlot, with a little manipulation, to
meld images into regular graphics. With Presentations it is easy to combine
images and graphics. Example:

Needs["Presentations`Master`"]

imag1 = Image[Import["ExampleData/lena.tif"], "Real"];

Draw2D[
 {ArrayDraw[Map[RGBColor, ImageData[imag1, "Real"], {2}],
   DataRange -> {{0, 2 \[Pi]}, {-1, 1}}],
  Draw[Sin[x], {x, 0, 2 \[Pi]}],
  White, Text[Style["Lena and a Sine Wave", 16], {2, -.8}]},
 AspectRatio -> .8,
 Frame -> True,
 ImageSize -> 300]


David Park
djmpark at comcast.net
http://home.comcast.net/~djmpark/  


From: Scot T. Martin [mailto:smartin at seas.harvard.edu] 

I'm taking a look at the new V7 Image[] command, and I'm left a bit 
confused.

1. Is Image[] any different than Graphics[Raster[]] that I'm more 
accustomed to?

2. If not, what was the point of introducing Image[]? Was it any effort to 
provide a more streamlined set of commands all revolving around Image[], 
e.g., ImageRotate[], etc.?


3. Image[] somehow upsets my unified view of Mathematica. That is, I like 
to try to "think" like Mathematica, and so I understand that all commands 
like Plot[], ListPlot[], etc., reduce to a Graphics[] object in 
FullForm[]. Similarly, I can build my own type of plotting function with 
Graphics[]. Most importantly, I can combine many different types of 
objects into a single Graphics[]. Am I correct that Image[] represents 
then a completely new display object? If so, is there a way, for example, 
to have an Image[] and then draw across it with an Epilog rule like you 
can do with Graphics[]? It seems a major setback if Image[] and Graphics[] 
cannot be readily mixed.

Anyone out there to make the case that Image[] represents an important new 
capability? I see it as a little worse than the usual "new command that 
does same thing old stuff did" because it seems to lose the capability to 
mix Graphics[] and Image[].

Please inform me if I'm completely off base. As I said, I'm just digging 
into Image[] now for the first time, and I'm a bit confused about possible 
merits---please do inform!








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