Resize layer to fit canvas - Gimp

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I'm currently using Gimp to resize some images. I'm a web developer but I don't really use image manipulation software much as most of the images are provided by designers so the Gimp tool is very unfamiliar to me. I've looked through all of the tutorials and help guides on the Gimp site but I cannot find the answer to the simplest of questions:

How do you resize a layer to fit within the current canvas whilst maintaining the aspect ratio?

I'm essentially setting a fixed size on my Canvas and importing an image as a layer into my project. What I then wish to do is scale this much larger image down so that is can fit within the Canvas with the aspect ratio preserved. I have found a way of scaling the Canvas to fit a layer but this is not what I am looking for.

Any help would be greatly appreciated.

This is easy to do, but among the hundreds of possible options to be put on the program UI, it was not "elected" to be there.

The way out is to use the program's scripting capabilities to perform the action: what have to be determined programatcially is whether the ratio of the image/layer is larger on the width or height, and use this ratio to scale tha layer, and then center the layer.

For your convenience, I wrote some Python code for this in a single line, in a way you can just copy and paste on the python console (filters->python->console) to apply the effect on the top layer of the most recent open image.

img = gimp.image_list()[0]; layer = img.layers[0]; factor = min (float(img.width) / layer.width, float(img.height) / layer.height); layer.scale(int(layer.width * factor), int(layer.height * factor)); layer.set_offsets((img.width - layer.width) / 2, (img.height - layer.height) / 2)

Since this can be done, but is not practical, even more because it does not allow you to pick the image or layer to resize, I formated it as a python-script for GIMP as well. Just check your edit->preferences->folders->plug-ins for your plug-in directory, paste the contents bellow as a file there (if on Windows, the file must have the ".py" extension. On Linux and Mac OS, any extension would work, but you have to give the file the "exectuable" property" ).

After restarting GIMP, you will have the new command conveniently located on your Layer menu:

#! /usr/bin/env python
# coding: utf-8

from gimpfu import *

def scale_layer_to_canvas_size(img, layer):
    pdb.gimp_image_undo_group_start(img)
    factor = min (float(img.width) / layer.width,
                 float(img.height) / layer.height)

    layer.scale(int(layer.width * factor), int(layer.height * factor))
    layer.set_offsets((img.width - layer.width) / 2,
        (img.height - layer.height) / 2)
    pdb.gimp_image_undo_group_end(img)

register("scale-layer-to-canvas-size",
    "Scale layer to canvas size",
    "Scales the layer to canvas size, keeping the aspect ratio",
    "João S. O. Bueno", "Public domain", "2014",
    N_("Scale layer to canvas size..."),
    "*",
    [(PF_IMAGE, "image",       "Input image", None),
     (PF_DRAWABLE, "layer", "Input drawable", None), ], [],
    scale_layer_to_canvas_size,  menu="<Image>/Layer/",
    )

main()

Note it is the same code than above, but "img" and "layer" are now suplied by GIMP when picking the action from the menu, and there are two extra calls so that both scalignand centering are "undone" as a single action - the remaining code is justtheneeded boiler plate to register the function with GIMP

6.19. Fit Canvas to Selection, You can access this command from the image menubar through Image → Fit Canvas to Selection. Prev · Up · Next · 6.18. Fit Canvas to Layers · Home  Fit Canvas to Layers The Fit Canvas to Layers command adapts the canvas size to the size of the largest layer in the image, in both width and height. When you create or open an image, the canvas size is defined as the image size and remains unchanged if you add new layers.

That feature is not in gimp for some reason. An alternative without any scripts is:

Layer -> Scale Layer

Is there any way to "Fit Layer to Canvas Size" in GIMP?, Essentially the opposite of Image -> Fit Canvas to Layers​​ Otherwise, use Layer>Layer to image size (that will crop the Layer instead if the layer is larger than the canvas, or will even extend it at places and crop it elsewhere if the layer is offset from the canvas). The Fit Canvas to Layers command adapts the canvas size to the size of the largest layer in the image, in both width and height.. When you create or open an image, the canvas size is defined as the image size and remains unchanged if you add new layers.

After shrinking my canvas using Image -> Canvas (and centering the layers as desired), the Layer -> Layer to Image Size did the trick (without scaling the image). This is with gimp 2.8.16

TUTORIAL: How to Resize an Image and Canvas, This tutorial shows you how you can resize an image in gimp to fit your project needs and Duration: 2:34 Posted: Feb 29, 2016 On your toolbox choose scale layer. Click the image/layer you want to scale. On the left side option for layers choose selection instead of layers/path. Then resize the scale. Choose OK after done resizing. Right click on the image and select Image > Fit Image to Selection. Right click again

As of GIMP 2.10, this is included by default in GIMP under Layer -> Layer to Image Size

TUTORIALS - GIMP - General #35, click on 'fit canvas to layers' to make the canvas the same size as all layers together Duration: 0:31 Posted: Mar 18, 2017 The Fit Canvas to Selection command adapts the canvas size to the size of the selection, in both width and height.

Gimp Tutorial 6 - Canvas size and Image scale, Gimp Basics : Layers, Move & Scale Tool - Duration: 19:43. Rajgopal Vaithiyanathan 16,548 Duration: 7:23 Posted: Sep 3, 2016 Before I get started, I’d like to make the distinction between resizing a layer in GIMP and resizing an image in GIMP. When you resize your image, you are resizing the entire composition – including all of the layers within that composition (if you have more than one layer). However, when you have a composition with multiple layers, you can resize an individual layer without resizing the entire composition.

resizing images to fit the canvas (2012), I can size the canvas perfectly, but when I add an image as a layer and try to resize the image, it will not resize to fit the canvas. How is this  All visible layers: only visible layers, marked with a icon, in the Layer Dialog, are sized to canvas size. All linked layers : only linked layers, marked with a in the Layer Dialog, are sized to canvas size.

How to resize canvas and background layer in GIMP?, If you want to just reduce the canvas size, see Image>Canvas size . If you have a 16x16 layer in the middle of large canvas, Image>Fit canvas  This tutorial shows you how you can resize an image in gimp to fit your project needs and what to do with blank space when you scale without breaking your image size ratio. My Patreon http

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