Re: [Gimp-user] Huge image problem

[Daniel Smith <opened to gmail com>]

How about converting to vector directly from gimp?
https://www.google.com/search?q=convert+gimp+to+vector&ie=UTF-8&oe=UTF-8&hl=en-us&client=safari


On Sat, Jul 6, 2019 at 12:21 PM rich404 <forums gimpusers com> wrote:

> > Hi,
> > So I am working on a many years long map making project. I am using a
> > scale of 1" to 10 miles and hand drawing it on 9x12" panels of paper.
> > The current size of the map is about 20 by 20 feet. This is obviously
> > too large to see in one place, so I have been using GIMP to panel them
> > together in a digital file. Obviously, this file is getting quite
> > large. I was hoping people might have suggestions on how to reduce the
> > size of the file without reducing the image quality too much. It's
> > only going to get bigger haha. I've got no experience with vector
> > based programs, is that the direction I need to head?
>
> Gimp is a bitmap (raster) editor, works in pixels not feet and inches. It
> can
> display in feet and inches but your individual canvas (tile) depends on
> how it
> is set up with a pixels-per inch (PPI) value.
>
> Since you started many years ago when the default was 72 PPI the tile size
> might
> be 864 x 648 pixels. Then file size also depends on greyscale or colour
> (RGB)
> RGB making larger files than greyscale.
>
> Can you give details - pixel size - grey/RGB/indexed or post one of your
> individual images (a tile)
>
> For a greyscale image one tile might be about 4 MB **in memory** so a
> complete
> 20' x 20' image 500+ tiles might be 2 GB - look at the bottom of the Gimp
> window
> for size in memory. Colour will be larger again. Not impossible for a
> modern
> computer but probably slow-as-a-snail for manipulating. Obviously when
> saved,
> the file is compressed and smaller.
>
> Making smaller? The only way in Gimp is scale each tile down (or the
> whole) but
> that will result in degradation of the image.
>
> Use SVG? Inkscape can convert a raster image to a vector but it all
> depends on
> the image. Better chance with line drawings than colour images. A vector
> should
> be smaller than the corresponding bitmap and of course scales up and down
> without loss of quality.
>
> Stitching together in Inkscape? Never tried 500+ images before. Do not
> know if
> practical or possible.
>
> --
> rich404 (via www.gimpusers.com/forums)
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