Converting an image from square to round question

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Converting an image from square to round question

Roundball
I have attached an image of a dog I would like to use for a project. The picture
is square and I wanted it to be round. I used the tools in Gimp 2 to get the
round shape I need but there is still the white square visible.

When I paste this image into my project, it shows the white square background. I
need to get rid of the white square background and keep the circle and
everything in it.

How do I make that happen?
Thank you in advance for your help
Bill

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Converting an image from square to round question

Roundball
>I have attached an image of a dog I would like to use for a project.
>The picture is square and I wanted it to be round. I used the tools in
>Gimp 2 to get the round shape I need but there is still the white
>square visible.
>
>When I paste this image into my project, it shows the white square
>background. I need to get rid of the white square background and keep
>the circle and everything in it.
>
>How do I make that happen?
>Thank you in advance for your help
>Bill


Sorry, here is the image....

Attachments:
* http://www.gimpusers.com/system/attachments/622/original/Millie_round.jpg

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Converting an image from square to round question

Roundball
In reply to this post by Roundball
>I have attached an image of a dog I would like to use for a project.
>The picture is square and I wanted it to be round. I used the tools in
>Gimp 2 to get the round shape I need but there is still the white
>square visible.
>
>When I paste this image into my project, it shows the white square
>background. I need to get rid of the white square background and keep
>the circle and everything in it.
>
>How do I make that happen?
>Thank you in advance for your help
>Bill

An image will always be rectangular but certain formats will permit
transparency. Jpeg is **not** one of those.

Very little change to your procedures.

Open Image, Add an Alpha Channel for transparency, Layers menu -> Transparency
-> Add Alpha Channel.

Make your Elliptical selection, Invert it, Cut it. The transparent bits are
depicted as a checker pattern. Kill the selection. Selection -> None

Now the important bit. Export your image as a png. File -> Export As Give the
file a name **including** the .png suffix. Just keep the default settings.

Attachments:
* http://www.gimpusers.com/system/attachments/623/original/aspng.jpg

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Converting an image from square to round question

Roundball
>An image will always be rectangular but certain formats will permit
>transparency. Jpeg is **not** one of those.
>
>Very little change to your procedures.
>
>Open Image, Add an Alpha Channel for transparency, Layers menu ->
>Transparency -> Add Alpha Channel.
>
>Make your Elliptical selection, Invert it, Cut it. The transparent
>bits are depicted as a checker pattern. Kill the selection. Selection
>-> None
>
>Now the important bit. Export your image as a png. File -> Export As
>Give the file a name **including** the .png suffix. Just keep the
>default settings.

Thank you Rich, but I did use those exact steps. The issue is that even though
the "square" is transparent, it is still there. When I then open the rounded
.png file in Meshcam (the software I am using for the next step in my process)
it is displayed with the square again.

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Converting an image from square to round question

Roundball
>Thank you Rich, but I did use those exact steps. The issue is that
>even though the "square" is transparent, it is still there. When I
>then open the rounded .png file in Meshcam (the software I am using
>for the next step in my process) it is displayed with the square
>again.

It is the application displaying the png that is to blame. Some will 'honour'
the transparency mask, others not.

example screenshot: left to right

Top -Browsers: Firefox **not** - Slimjet browser does

Bottom - viewers: viewer1 does - viewer2 **not**.

That does not mean that the end result will not be ok. In your case, you will
only really know when you etch something.

Since your application is for CNC why not

1. Same steps then export as a .bmp file. The Meshcam web page says bmp is ok
and bmp supports transparency. (although you might have to try the compatibility
option in the bmp export dialog)

2. There is a Meshcam forum, ask the question there.

Attachments:
* http://www.gimpusers.com/system/attachments/624/original/compare.jpg

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Converting an image from square to round question

Roundball
A bit about using a photo here.  Only skimmed through it, but if it takes the
image as a height map then there will be a bit of processing to do before
putting it into your project. Probably a white background will not matter.

http://www.grzforum.com/viewtopic.php?f=3&t=15761&sid=cac4e92bd34cf50e94df54f78e274e3e

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