Re: Option 'ai' in Postscript terminal

[Daniel J S. <dan...@ie...>]

Harald Harders wrote:

>>However, Daniel's upcoming binary + image patch depends on the
>>Level2 operator "filter", so we will have to keep an eye on that.
>>    
>>
>
>We should speak to him to ensure that also the filter operator is not used
>when using level1.
>

Here are the commands that the image routine uses:

%%%%BeginImage
gsave
translate
scale
[ M 0 0 N 0 0 ]
currentfile /ASCII85Decode filter
false
%%%%BeginPalette
[ /Indexed\n  /DeviceRGB
<bunch of characters for palette>
] setcolorspace
%%%%EndPalette
<<
/ImageType 1
/Width M
/Height N
/BitsPerComponent
/ImageMatrix [ M 0 0 N 0 0 ]
/Decode [ 0 #]
/DataSource currentfile /ASCII85Decode filter
/MultipleDataSources false
/Interpolate false
 >>
%%%%BeginData
colorimage
image
<bunch of characters for image>
%%%%EndData
grestore
%%%%EndImage

The only non level-1 suspect commands might be

/DataSource currentfile
/Interpolate false

The filter Ethan refers to is the ASCII85Decode filter, which I'm 
guessing would have been in PostScript from the beginning.  The reason 
for the /Interpolate false is that for a scientific plotting program 
there shouldn't be any additional image processing done beyond what the 
user may have applied or intended.

Dan