Re: [Gimp-user] How to enhance low resolution graphic for larger modified image ???

2010-01-26 Thread Chris Mohler
On Tue, Jan 26, 2010 at 1:55 PM, Jay Smith j...@jaysmith.com wrote:
 On 01/26/2010 02:49 PM, helices wrote:
 I have a simple JPG (108x170 pixels) that I want to use in a larger,
 higher resolution image that I'm creating.  It is a fairly simple black
 and white drawing -- actually, a light bulb with several curves and
 angles and straight lines.

 This may be missing the point somehow, but if you used some kind of
 outlining program (followed by a little editing) that creates a
 vector-based (instead of bitmap based) image, you could then scale to
 whatever size you want with perfect resolution, and then convert that
 size to a bitmap format like JPG.  If you save the vector version, you
 can scale-and-save-out to as many sizes as you like.

I would open Inkscape, import the graphic, then either do a trace or
redraw it.  Then delete the image, save as SVG, open in GIMP at
desired size.

 Back in the day I used Adobe Streamline for this kind of task, but I
 don't know if that even still exists any more.

Streamline was for OS 8-9 IIRC, and never got ported to OSX.  I use
inkscape to do tracing - it works better than the auto-trace feature
in Adobe's products anyway (especially on blank-and-white images).

Chris
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Re: [Gimp-user] How to enhance low resolution graphic for larger modified image ???

2010-01-26 Thread Akkana Peck
helices writes:
 I have a simple JPG (108x170 pixels) that I want to use in a larger,
 higher resolution image that I'm creating.  It is a fairly simple black
 and white drawing -- actually, a light bulb with several curves and
 angles and straight lines.
 
 Yes, I have expanded it to 1000x1575 pixels.  Yes, I've zoomed to 800x,
 selected non-black pixels and deleted them.
 
 What I have now is almost tolerable; but, I'd like to know alternatives,
 preferably the simplest, most straight forward method to clean up the
 jagged edges that are visible.

Try this:

- Select by color and click on one of the lines.

- Selection to Path.

- Select None.

- Scale the image up to the desired size.

- Path to selection.

- Fill the selection with black.

It doesn't work for everything, but for a line drawing or solid
colored block figure, sometimes you can get amazingly smooth edges
that way.

...Akkana
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