How to reduce the size of a photo with Photoshop without losing quality

If we are looking to save space on our hard drive or if we want to reduce the space occupied by a certain photograph, we have at our disposal a large number of applications at our disposal. However, if we are interested in controlling the quality to lose as little as possible, there is no better application on the market than Photoshop.

Photoshop is the best photo editor available today, an application that is updated every year to add new features, features that make use of machine learning and artificial intelligence to carry out processes practically automatically.

reduce the size of a photo with Photoshop without losing quality

Methods to reduce image size

By compressing an image , we are reducing the size of the file, we are not talking about changing the size of the image, although this also affects certain images. Each image format uses different algorithms to modify the way data is stored in order to reduce the size of the data, just like different video codecs.

Modify image quality

While with most of the applications that allow us to reduce the size of the images, it does not allow us to establish a minimum of acceptable quality to obtain good results, with Photoshop we do have that possibility. In addition, it allows us to obtain a preview of the image before saving it so we can quickly know if it is the one we are looking for.

When we modify the quality of an image we are reducing image data, data that is barely perfectible for most people. In addition, redundant visual information that adds nothing to the image is always removed.

Reduce the size

Another method that we have at our disposal in Photoshop and that we can also find in many other applications is the option to change the size of the image, that is, the resolution . By modifying the resolution of the image, the space it occupies on the disk is reduced, however, the quality of the image is also lost, as well as limiting the possibility of enlarging it up to the original resolution and being able to see the details that it shows us.

When you reduce the size of the image, information must be removed from the image in the process, so, just as if we reduce the quality, we are losing information, information that, for most people, is imperceptible.

Change format

The JPG format is the most used when working with images because it maintains a decent quality with a small size. However, it is not the best option if we want to preserve quality, despite being capable of representing up to 16.8 million colors, which is why professional photographers opt for the RAW format, a lossless format.

The PNG format is commonly used in the field of graphic design, as it allows you to add transparent backgrounds. However, the level of compression of this format is practically non-existent, being other formats, like TIF, that we must avoid at all times.

In addition to the JPG and PNG format, we can also find files in the TIF format. This format offers a higher image quality, however, the compression is practically nil, so the size of these files is very high and it is not a good option if what we want is to save space on our computer.

Another format that is also used to store images. Although it was not designed for this, it is mainly used to display short animations. Although the compression level is higher than the JPG format, it does not support the same number of colors, so it is only ideal for images with very little chromatic variety.

How to Compress Images in Photoshop

Once we are clear about the different methods that we can use to modify the size of an image, then we will show you how we can carry out the different processes in Photoshop. To show you the steps to follow, we are going to use an image with a resolution of 6000 × 4000 and that occupies 7 MB .

reducing quality

To reduce the quality of an image in Photoshop, without changing the resolution, once we have opened the image in Photoshop, we go to the File menu and then click on Export – Export as . In the window shown below, click on 2 copies so that the original image and the final image after reducing the quality are shown on a split screen. This way we can check the result before making the change. Next, we must select which of the two images we want to show the preview of the changes.

Cambiar calidad imagen Photoshop

Next, click on the + or – button located in the 2 copies panel to enlarge the image and better check the results that we will obtain by reducing the quality. Next, in the panel on the right, File Settings , we place the mouse on the scroll bar to increase the quality, going up to level 7, or reduce it. As we move this slider, in the center panel, we’ll see what the final size of the image will be when selecting that quality. We do not modify the file format (JPG), since, as we have explained in the previous section, it is the format that offers us the compression-quality ratio.

Cambiar calidad imagen Photoshop

Going from level 6, the default image opener, to level 3, we went from a size of 7 MB to just under 1 MB . Although you can’t see it quite right in this shot, the image has barely lost any color in the front part of the image, becoming a lighter greenish tone than in the original image.

To save the file, we just click on Export and set the path where we want to save the file.

Changing the size

If we want to change the size of the image to reduce the space it occupies in Photoshop, once we have opened the image in the application, we use the Control+Alt+i key combination and go to the Width section and select the size we want it to have. the image and to the extent, we use pixels. To give us an idea, the resolution of televisions and monitors is Full HD, that is, 1920 × 1080, an ideal resolution to display the image on a full screen avoiding pixels that all they do is make the image ugly. If we use the 1920×1080 resolution on this image whose original resolution is 6000×4000, we will go from a 7MB file to a size of 700KB.

Cambiar tamaño imagen Photoshop

Regarding the size that the application shows us at the top of this window, we have to divide it by 100 to obtain the real value. The image in the original resolution of 6000×4000 pixels is 7MB (68.7MB/10) and after changing the resolution to 1920×1080, the final file size is 700KB (7MB/10). Once we have modified the resolution of the image, we go to the File menu and select Save. If, in addition to reducing the resolution, we also want to modify the quality, we will have to select Export – Export as and select the quality level we want. As we move the bar, the final space that the image will occupy will be shown, this data is real.

Cambiar tamaño imagen Photoshop

Modifying the format

As we have explained in the Change format section, JPG is the format that offers the best result in terms of quality-size ratio. To give us an idea of the level of compression of the image with which we have illustrated the examples in this article, we only have to verify that the original image with which we have worked was a file in PNG format, a file that before converting it to JPG format occupied 31 MB, more than 3 times the size in JPG format while maintaining the resolution. To change the format of this image, first of all, we have opened it with Photoshop and, next, we have gone to the File – Export – Export as menu. In the File Settings section, in format, we have clicked on the drop-down box to select JPG.

Cambiar formato imagen Yahoo

By modifying the format in the left panel, the final size of the file will be displayed according to the original resolution. If, in addition, we also modify the resolution, we will further reduce the space occupied by the image, so the final space saving will be considerable.

Cambiar formato imagen Yahoo