gThumb
gThumb is an image viewer, image browser, image editor, and photo manager utility.
How to Install gThumb:
1. Open the Terminal (Shortcut: Ctrl + Alt + T)
2. Type the following command: sudo add-apt-repository ppa:dhor/myway
3. Press Enter or Return and type in your password
4. Type the following command: sudo apt-get update
5. Type the following command: sudo apt-get install gthumb
6. Type Y and press Enter or Return
How to Uninstall gThumb:
1. Open the Terminal (Shortcut: Ctrl + Alt + T)
2. Type the following command: sudo add-apt-repository --remove ppa:dhor/myway
3. Type the following command: sudo apt remove gthumb
1. Open the Terminal (Shortcut: Ctrl + Alt + T)
2. Type the following command: sudo add-apt-repository ppa:dhor/myway
3. Press Enter or Return and type in your password
4. Type the following command: sudo apt-get update
5. Type the following command: sudo apt-get install gthumb
6. Type Y and press Enter or Return
How to Uninstall gThumb:
1. Open the Terminal (Shortcut: Ctrl + Alt + T)
2. Type the following command: sudo add-apt-repository --remove ppa:dhor/myway
3. Type the following command: sudo apt remove gthumb
You can use your Page Up or Page Down arrow keys to move through your images folder.
You can also click on the Next image button or Previous image button that will hover over your image when you put your mouse pointer over your image.
If you click on the Thumbnail button on the bottom right, you will see thumbnails of the images in your current folder. You can turn it back off by clicking on it again.
Underneath the Titlebar is the Toolbar that contains 13 buttons. A = View the folders, B = Fullscreen, C = Set to actual size, D = Fit to window if larger, E = Resize, F = Rotate Left, G = Rotate Right, H = Properties, I = Edit file, J = Comment, K = Tags, L = Tools, and M = Menu.
When you click the Edit file button, you will see a list of options that will allow you to edit your image.
In the slideshow below, you can see a brief description of each editing feature or tool.
To crop an image with gThumb, you need to be in the edit mode. Clicking the Edit file button on your toolbar will give you access to the editing features (as seen in the image above). Select the image you want to modify or crop and then click the Crop button under the Format section. You can now drag the gridded window over the area you wish to crop and when you have finished click the Accept button. You can the click the Save button to save the changes to your image or click the Save As button to give your modified image a new name.
Clicking on the ... button or Menu button will create a drop-down menu.
You can make changes in gThumb Preferences. You will see six tabs on the left side of the gThumb Preferences dialog box. They are General, Browser, Viewer, Saving, Print, and Extensions.
You can resize an image by clicking on the Tools button on the toolbar. When the drop-down menu appears, click on the Resize Images... button.
A Resize Images dialog box will appear to allow you to change the size of your image. As you can see on the status bar across the bottom of the gThumb viewer, the size of the image is 7952 x 5304 and it's 7.1 MB in file size. My screen resolution is 1920 x 1080 so I resized the huge image to save storage space. I entered 1920 in the Width section and 1080 in the Height section and then I clicked the Execute button to resize the image.
You will then be prompted with an Overwrite dialog box. You then have the option to overwrite the old file or give your new image a different name.
If you look on the status bar you will see the image is now 1920 x 1080 and is 470.3 kB or .470 MB. This will save a lot of storage space just by resizing one image.
You can view an image's Metadata by clicking on the Propeties button on the toolbar.
With digital photography we now have to be concerned about "metadata" or the hidden information embedded within your photos. The information found within your photo might include items like the GPS coordinates of the photo’s location, the date and time it was taken, the camera type and shutter settings, and the software used to edit the photo. To a photographer this information is great to help him or her organize their photos; however, if you are a parent you don't want your child taking photos and uploading them to the Internet exposing their current location via GPS coordinates. As you can see in the image below, it was taken by a Samsung SM-G920W8 camera and the GPS coordinaces provides the address of Wilmington Trail in Essex County in New York. You can find a lot of websites online that looks at the metadata of digital images and provides you with an address for example, Pic2Map Photo Location Viewer.
https://www.pic2map.com/lufmrs.html
Below is a picture that my brother took when he went to California in April 22, 2014. He went for an interview to be on Big Brother 16 US. The next day he e-mailed me several pictures from his trip. At the time, I was not allowed to show anyone any of the photos he sent me; however, now since he's already been on the show it's no big deal. As you can see in the metadata of the image his photo was taken on an Apple iPhone 4 and it provides you with a lot of other information. However, he did not have his iPhone set to record GPS coordinates to embed in his images.
I uploaded his photo on pic2map.com just to make sure that no GPS information was embedded in his photo.
https://www.pic2map.com/utqbwb.html
gThumb allows you to remove or delete the metadata from an image by clicking n the Tools button and then click on the Delete Metadata option.
You will be prompted with a small dialog box making sure that you want to permanetly delete the metadata of your selected image.
The metadata recorded by the iPhone 4 is now removed from the image. If the original image did have GPS coordinates embedded within it, then you no longer could find the location where the image was taken.
gThumb is also a great photo management software. You can use it to label, group, and organize your photos. gThumb can organize your images into catalogs based on the date images were taken or edited or by tags of the images. For more infomation on managing your images look under the File Management section on the gThumb Help website.
gThumb comes with a lot of editing tools for touching-up your photos and it comes with batch tools to allow you to modify multiple images simultaneously. gThumb supports .jpg, .jpeg, .gif, animated .gif, .tiff, .png, and .webp (not animated .webp images) image formats. gThumb also supports plug-ins to extend or expand the capabilities of the program.
I do not use gThumb as my default image viewer, but I do have it installed on all my linux machines because of its quick editing features such as cropping and resizing an image.
I do not use gThumb as my default image viewer, but I do have it installed on all my linux machines because of its quick editing features such as cropping and resizing an image.
Feb 13, 2020
