Legacy ImageMagick Discussions Archive

I wanted to select transparent pixels starting from coordinates:
x = 1 / y=1 / tolerance=0px

and then Stop selection where the edge of the image starts.

Transparent pixels ' within the image should not select, only the boundary/edges of the image should be selected. I tried different command but I'm unable to achieve this. can somebody help

What version of IM, on what platform?

The top-left pixel is at (0,0), so (1,1) is in the next column and next row.

I don't understand what you want. IM doesn't really "select" pixels. Instead, we make a mask image where two colours represent selected or not selected. The mask can then be used to process just the "selected" pixels.

"-alpha extract" will make an image that is black where pixels were transparent. Then you could make all pixels except edge pixels white, with "-draw rectangle". Then you might flood-fill from top-left.

Perhaps you can supply a sample input, and say what the output should be.

Hi, thanks for the reply.
I'm using the 7th version and would like to implement it on ubuntu server.

here what exactly I'm trying to do: < these are product images for e-commerce store>

- first Increase canvas size with 2 pixels horizontal and 2 pixels vertical (relative)
- Select all transparent pixels starting from coordinates x = 1 / y=1 / tolerance=opx. Stop selection where the edge of the product starts. Transparent pixels 'within the product are not selected, only the boundary/edges of the product.
- Invert selection
- Create a work path from selection
- Set name of clipping path to 'Path 1'
- Decrease canvas size with 2 pixels horizontal a 2 pixels vertical (relative)
- Save file

IM cannot create clipping paths.

isn't there any solution ?

nischaynamdev wrote: - Create a work path from selection
- Set name of clipping path to 'Path 1'

This is vectorization, conversion of a raster image (pixels) into vectors. IM can't do that. Programs that can include:

Potrace
Autotrace
Inkscape
Gimp
traceContours (by me, unpublished)