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Why doesn't image scale?

Jan 9, 2013, 19:49
Post: #1
Question Why doesn't image scale?
When I use the scale tool on an image, I get that thing where I have to type in the pixels, but after I do that, and press Scale, I get the scale loading thing, but nothing happens, and the image remains the same size. It also doesn't work if I manually drag the image to size. It's only works when I type in the pixel width, then press enter, then Scale, but this makes the picture remain the same size. I also can't rely on this since I don't know the pixel size. This is what I hate about Gimp, either it's really glitchy or it's super complicated and I don't know how to fix something as simple as this. It's not the first problem I've had, and I have to close with saving, reopen everytime.
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Jan 9, 2013, 21:53 (This post was last modified: Jan 9, 2013 21:55 by ofnuts.)
Post: #2
RE: Why doesn't image scale?
There are three very different scale operations in Gimp:

1) scale the selection: this what the Scale tool (Scale) is meant for. It can also scale a complete layer interactively. It will also scale "chained" layers but not the rest of the image.
2) scale a layer ("Layer/Scale layer"). This scales one single layer, but not the rest of the image
3) scale the whole image ("Image/Scale image"). This scales the whole image: layers, channels, paths....

I assume you want 3). In "Image/Scale image", you can provide a size in pixels or in inches or centimeters, but that assumes that you know you intended "print definition" in PPI because the three are related:
Code:
physical_size=size_in_pixels / print_definition

On the whole you cannot significantly increase the size in pixels of your image without degrading its quality (the size in pixels is really the amount of fine detail in your image, to increase this size you would have to provide more detail...). So you may have to find a compromise between the size your have and the indented print size and print definition.

Gimp isn't complicated, it's complex because bitmap editing is complex and Gimp is powerful. It can do a lot more things than your garden-variety photo manager. This has a price in usability for the simpler functions, and the learning curve is a bit steep at the beginning. This said there are plenty of forums with friendly people to help beginners Smile

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