To improve a picture's resolution, increase its size, then make sure it has the optimal pixel density. The result is a larger image, but it may look less sharp than the original picture.
The bigger you make an image, the more you'll see a difference in sharpness. This process makes the picture larger and adds pixels, not more detail. To mitigate the loss of sharpness, follow these tips:. It offers broad support for a host of image formats, making it ideal for this kind of task. Here's how to improve image resolution with GIMP:. Open GIMP. In the Open Image dialog box, choose the image and select Open. Make sure the image window is the active window.
To ensure the final picture has a resolution of pixels-per-inch, select Advanced Options. The dialog box expands, revealing the X and Y resolutions for the image. The boxes may show the canvas is set to If it is not, adjust the X and Y values to , then select OK. You now have a new image window which has the same dimensions as the original photo. The Set Image Canvas Size dialog box opens. This is where you'll adjust the canvas size. Before you adjust the canvas width or height, make sure that the chain icon to the right of both measurements is locked.
Enter the new image width, then press Tab. The height automatically adjusts to match the image scale. This example goes from just over pixels to pixels. Select Resize. Drag the corner of the image window and zoom out if necessary to see all corners of the resized canvas. The image is pasted in the center of the new image window at its original size.
To make the pasted image fully cover the new canvas size, go to the Layers dialog and select Floating Selection Pasted Layer if it isn't selected. Go to the Toolbox dialog and select the Scale tool. Select the pasted image. A scale guide and the Scale dialog box appear. In the Scale dialog box, ensure the chain icon is locked, then enter the same width value you used in step You'll see a preview of what the resized image will look like. If it looks good, select Scale. The image is resampled at the newer size.
Before exporting the image, check the quality of it by zooming in. When you're happy with the result, go to the Layers dialog, right-click Floating Selection Pasted Layer , then select Anchor Layer to lock it to the background. This opens the Export Image dialog box.
In this example, we had an image with a ppi resolution. I wanted to print this image in a professional publication and the image needed to be at least ppi. The Pixel Dimensions have stayed the same because we did not add or subtract any pixels to the image. However, note that the Document Width and Height decreased by half when the Resolutio n doubled. Our image started at 10" x 6.
This means that in order to print at ppi and retain full-quality, I can print this image only as large as 5" x 3. What happens if we decrease our resolution from ppi to ppi?
As you may have guessed, our Document Width and Height doubled when we halved our Resolution. We started with a 10" x 6. Now my image will print larger, but the quality will be much lower. We notice that the pixel dimensions never change. We started with an image at x pixels px and ended with the dimensions still being x px. This is important to remember, because when we change resolution we are changing only how many pixels will be displayed per inch of the image, not how many pixels make up the image.
Imagine you and a friend each having a bucket full of seeds to plant in a field. You must use all of your seeds by planting them in 1 inch squares in a field. Now imagine that you are allowed to plant only of your seeds per inch and your friend is allowed to plant seeds per inch. Both of you have the same number of seeds, but it will take you twice as much surface area in the field to plant all of your seeds. In this example, our image has been sent to print from a laser printer on standard 8.
The print quality is extremely low, leaving the image looking very blurry or "soft". Bicubic Sharper best for reduction - Based off of Bicubic sampling and works best when reducing images while keeping detail sharper.
If image appears too sharp, Bicubic is recommended. In this example, we reduced our image size by changing the resolution from to 72ppi and changing the pixel dimensions from x to x px. Notice that when we reduced the image size, our file size was also reduced from Web images work differently than printed images. With printed images, we must pay close attention to resolution to ensure we get a high-quality print. For web images, we must focus on the pixel dimensions. Look at the two images below - one is ppi and the other is 72ppi.
Pixel Dimensions x ; Resolution ppi. Pixel Dimensions x ; Resolution 72ppi. Both of these images display at the exact same size even though their resolution varies. This is because the pixel dimensions are what really matter when working with web images. Notice that the pixel dimensions of each image are the same and therefore both images will display at the same size even though they have differing resolutions. University of Michigan Library Research Guides. Ask a Librarian. Focuses on many common image questions in regards to image resolutions, resizing images, file types, vector and raster images, scanning, saving and more.
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