[Tioga-users] monochrome image

[Bill Paxton]

Hi,

Here's a little example of a monochrome image using checkerboard data.

     def mono_image
	table = build_table(0.1, 0.9)
         samples = t.create_monochrome_image_data(table, 'boundary'  
=> 0.5)
         t.fill_color = Black
         t.show_image(
             'width' => 8,
             'height' => 8,
             'color_space' => 'mono',
             'data' => samples,
             'interpolate' => false,
             'll' => [0.1, 0.1],
             'lr' => [0.9, 0.1],
             'ul' => [0.1, 0.9])
     end


Here are two screen captures showing the result:

The first one is from Adobe's acroread (naturally, it looks like it  
should):

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The second is from Apple's preview (and unfortunately it isn't so  
great):

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It seems that Apple doesn't pay attention to the flag that should  
control interpolation.



I've included the pdf file below in case you'd like to check your  
favorite viewer!

Cheers,
Bill



Here's the checkerboard data:


     def build_table(light, dark)
         num_cols = 8
         num_rows = 8
         table = Dtable.new(num_cols, num_rows)
         row0 = Dvector[light, dark, light, dark, light, dark, light,  
dark]
         row1 = Dvector[dark, light, dark, light, dark, light, dark,  
light]
         table.set_row(0,row0)
         table.set_row(1,row1)
         table.set_row(2,row0)
         table.set_row(3,row1)
         table.set_row(4,row0)
         table.set_row(5,row1)
         table.set_row(6,row0)
         table.set_row(7,row1)
         return table
     end






Here's the PDF file:
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