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This will prevent you from writing over the original. Use '100' to fill the width, then a fixed value for the height (assuming you know what the height of your image is).

That allows you to enter two parameters - width and height, in that order. Well I was able to get it working with the other answer. Save the image with a new name by selecting "Save As" from the File menu. To fill width-wise, use 'background-size'. This should not be necessary unless you have locked the proportions when resizing the image. Move the image if needed by selecting the "Move" tool and dragging the image into place. Press "Enter" on the keyboard to accept the change you made to the image. For example, here is what happens when you try to. You can also type the exact proportions you want the image to have in the Width and Height text fields in the Scale panel. The aspect ratio of the background image does not change to avoid squeezing or stretching the original image. Alternatively, drag the right or bottom "handle" on the edge of the image. Stretching an image You can also specify both the horizontal and vertical sizes of the image, like this: css background-size: 300px 150px The result looks like this: Scaling an image up On the other end of the spectrum, you can scale an image up in the background. I can stretch the image to fill the entire background with these numbers, or I can calculate the difference in ratio, and stretch the image accordingly, but keep the aspect ratio. Even a human face can often be stretched by five percent without it appearing distorted.ĭrag the bottom right corner of the image to the bottom right corner of the canvas to fill the canvas with the image.

Whether you constrain the image proportions or not depends on how much stretching you need to do and what the image depicts. The Scale panel opens and eight square handles appear along the border of the image.Ĭlick the "Chain" icon in the Scale panel if you want to constrain the proportions. The image is placed over the background, and if the window is wider than it is tall, the image centers itself in the middle over the black background, and it all looks very nice. This icon is a square with an arrow pointing down from one corner.Ĭlick the image. I have a square background image, which fades to black around the edges, and then the main window has a black background.