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300dpi image from 72dpi

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300dpi image from 72dpi Bob Meetin 10 Sep 16:36
  300dpi image from 72dpi David Gowers 10 Sep 17:04
Bob Meetin
2008-09-10 16:36:03 UTC (over 16 years ago)

300dpi image from 72dpi

see:

www.dottedi.biz/images/danger.gif www.dottedi.biz/images/danger-300dpi.gif www.dottedi.biz/images/danger-300dpi.jpg

The danger.gif image - I created it from a couple pieces of clipart, the doggie and triangle, then created the oval, text etc with gimp, all as the default resolution. It wasn't intended for print then but is now.

Other than converting to 300dpi in GIMP, how do I ensure that it's good 300dpi, meaning that through the conversion wouldn't GIMP have had to guess and fill in the missing pixels.

Do I need to go back to the drawing board and bring it all in as 300dpi?

David Gowers
2008-09-10 17:04:49 UTC (over 16 years ago)

300dpi image from 72dpi

Hello Bob,

On Thu, Sep 11, 2008 at 12:06 AM, Bob Meetin wrote:

see:

www.dottedi.biz/images/danger.gif www.dottedi.biz/images/danger-300dpi.gif www.dottedi.biz/images/danger-300dpi.jpg

The danger.gif image - I created it from a couple pieces of clipart, the doggie and triangle, then created the oval, text etc with gimp, all as the default resolution. It wasn't intended for print then but is now.

Other than converting to 300dpi in GIMP, how do I ensure that it's good 300dpi, meaning that through the conversion wouldn't GIMP have had to guess and fill in the missing pixels.

Ah, I think you misunderstand the DPI setting. In this context, it determines how many of your pixels go into a printed square inch. Printing this 200x200 pixel image at 300dpi would mean it got printed only 2/3rds of an inch big.

.
.
.

I suspect this is *not* what you want :)

Do I need to go back to the drawing board and bring it all in as 300dpi?

I recommend, instead of using GIMP for this, import the image into Inkscape, and use the 'Path->Trace Bitmap' feature to convert it into a vector graphic. which it's easy to render at any DPI using the 'File->Export bitmap' dialog.
It's slightly more complex than that (the dog may not convert well, and may require some adjustment). At that point you could make any touchups you think are needed to the rendered 300dpi image.

If I was making a graphic like this, I would do it all in Inkscape -- this sign contains mainly vector elements.

If you prefer to use only GIMP, then you probably will have to start from the beginning.

Hope that helps,

David