enlarging images by copying?

Arp wrote on May 10, 2010

Hi!

I go a fits image which has 2x2 pixels, they have the value:
1 0
0 1

Now, I want to copy those pixels in x and y direction by an integer factor so that the new image will have a dimension of 3040x2016 containing the same pattern like

10101010101010101
01010101010101010

and so on.

I tried blkrep, but it creates something like
00001111
11110000

Can you suggest another way to this please?

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Mike Fitzpatrick wrote on May 10, 2010

cl> artdata
ar> mkpattern foo.fits pattern=checker v1=0 v2=1 ncols=3040 nlines=2016

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Arp wrote on May 10, 2010

Thanks! that works!

I created a file with the pattern

01
10

But I am having problems creating the patterns
10
00

and
00
01

I used grid as a pattern option but it gives me
01
00

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Mike Fitzpatrick wrote on May 10, 2010

For MKPATTERN the options for the pattern are spelled out in the help page. Note you can do things like invert the v1/v2 values or copy out image sections (e.g. "

" to subsample by 3) to invert the pattern or create an offset. Otherwise, have a look at the IMEXPR task where you can use the array index in an expression to create some sort of pattern. You also have the option of copying an image/section into the section of an output image to create an arbitrary repeating pattern. </div> --- *Last post on May 10, 2010*