How To Resize Images In GIMP & Minimize Loss of Quality

in today's tutorial you'll discover how to resize your images with a minimal loss of quality if you're ready let's do it alright so there are two main options for resizing your image one is the scale tool so if you're using this to resize make sure to select image next to transform in the tool options to improve the quality of the resize you'll select from one of the options under interpolation i'll explain what that is and how each option will affect the quality in just a moment first i want to point out that the one thing you cannot do in the tool options when it comes to resizing in via this method is adjusting the resolution of your image this can be done with the second option for resizing your image by going to image and selecting scale image from here you can adjust the width and height like you can with the scale tool and then under that you can set the resolution for both the x and y axis i recommend keeping these two options linked together unless you have a specific reason not to also if you want the image to retain the same aspect ratio it has now after resizing make sure the width and height are linked from here so this link icon is the key for linking them they are both currently linked to each other and when i click here they become unlinked all right so down here we have a quality section and just like with the scale tool you have some interpolation options these options are the secret to minimizing the loss of quality when resizing and i say minimizing because it's impossible at least at the time of this tutorial to eliminate the loss of quality altogether so what exactly is interpolation well let me explain and then we'll cover your options to minimize the loss of quality all right so quality issues arise any time you resize an image larger or smaller so the software you're using whether it's photoshop or anything else it has to increase the number of pixels to fill that new size or shrink the amount if it's becoming smaller so when you're enlarging this causes your image to become pixelated because has to fill in the gaps of the missing pixels so it's adding extra pixels from and to your image and you end up with a lower quality image now when you're downsizing an image has to remove pixels so your image fits into the smaller size this results in a loss of detail since has to get rid of some of those pixels now this process of adding or removing pixels is known as interpolation so gives you five algorithms for how to interpolate your images so we're gonna go over each of these and see how they affect the quality all right so our default option is called none and when enlarging it's going to take the color of each pixel and copy the ones next to it the benefit of this option is it's the fastest however it creates a coarse or pixelated image and the larger you go the lower the quality of your final resize our next option is called linear so linear takes the color of each pixel and computes the average color of the four closest pixels in the original size the results are a higher quality versus none but it's a bit slower however it is a good compromise between speed and quality our next option is cubic which is similar to linear except instead of averaging four of the closest pixels it takes into account the eight closest pixels and as you might expect it does take longer to render with this option but the results are usually worth the wait our next two options are low halo and no halo so one of the downsides to using interpolation is the creation of halos or digital artifacts that can lower the quality of the image so low halo will reduce the amount of halo artifacts where no halo will remove them completely in theory anyways so each one of these is progressively slower versus the other options mentioned so the question then becomes which one should you choose well it's not an easy question to answer it's something you'll have to experiment with on your own images to find out which one gives you the best results now with today's digital cameras the resolution straight out of the camera can produce very large prints on their own so let's say you're creating an enlargement that is 40 by 60 or larger you may want to go with cubic or one of the halo options if not linear should be sufficient for prints smaller than 40 by 60 and when downsizing so this of course is based on personal experience and preference you'll have to discover what works best for you before you go i have a huge announcement tomorrow is day 30 of 30 and it's going to be spectacular because we are going to explore the future of with 3.0 yes 3.0 is right around the corner and you're going to find out my top seven enhancements and tools coming to 3.0 tomorrow thanks for listening and have an awesome day

Channel: Parker Photographic

Views: 4,137

Keywords: parker photographic, gimp resize image, gimp resize image without losing quality, gimp resize image to fit canvas, gimp resize selection, gimp tutorials, gimp tutorial, resize image without losing quality, how to resize an image in gimp

Id: lSUisrAEJmo

Length: 5min 52sec (352 seconds)

Published: Thu Apr 29 2021