This image has interpolation on the middle part I think. The image I am looking for is a diamond shape I think because it is a square rotated 45 degrees. do you know how to modify this mathmap script so there is no cropping? thanks

filter slide (image in)

if y>=x then

in(xy:[x,y-x-1])

end

end

Have you tried Image/Canvas Size
Then just make the canvas taller and wider.

Run your filter again.

yes I have tried that, it cuts out half the image still

But I have tested it and that mathmap script does not modify the image at all. So does someone know to change it so it doesn't crop the image and keeps then entire diamond shape?

it still cut the image because the most relevant step is missed

As i suggested before

enlarge the canvas of 1.5,
then don't miss this, Image/layer to image size

it is the most important step, that will add the space needed to avoid cropping

About modify the MM i am sorry i can't help if not with the link i already give, that of the Google mathmap group

Sorry interbloke, but I don't think you understand what you are asking for. As stated a few times by a few people, what you are asking for (to take the image you posted and rotate it with NO bluring/interpolation, etc) is not possible. Period.

The shearing I posted based on a modified version of your code "fakes" it my shifting each column of pixels up by one pixel but is NOT a rotation, it is a shear. There is certainly no interpolation at all.

If you want a diamond shape with those offset pixel lines, take your original image and tile it 4 times, run the mm code I provided, then select and crop out a diamond from the middle of it:


-Rob A>

Ah. Ya ninja'd me on that one RobA but going to post my work anyway.

Open your image in Inkscape. (Actually I opened Inkscape and dragged and dropped the image into it.) Click the image so that it has black arrows around it.



File > Document Properties > Fit page to selection

Close that window where the X is in the dark gray header bar. (Red arrow pointing to it.)



Black selection arrows still visible.

Object > Transform > Rotate > 45°, click apply and again click the X in the dark gray bar.

Black selection arrows still there.

Back to File > Document Properties and Fit page to selection.

Inkscape can now export your image as a png file.

File > Export Bitmap

Browse to where you want to save it. You will need to give it a name and a png extension.

Click Export. Close that dialog with the X.

Close Inkscape. It will want to know if you want to save it. If you want to save it in Inkscape's native format as an svg vector image you may, or just close it without saving.