Altering WordPress Media setting to prevent resizing of screenshot
WordPress will automatically resize any screenshot you take of a webpage. You are left with a reduced image which is too small to view.
The following procedure enables you to retain a full sized snapshot.
Normally you capture a screenshot of a webpage or part of the image on the screen. Then upload this image to a post in WordPress.
To retain the full size of the image you need to change the current setting in Media. This will stop WordPress automatically resizing the image when it is loading your screenshot.
Take a screen shot of the original media setting so that you can restore these setting once you have finished creating your screen shots.
Then remove all the current settings in Image sizes, replacing them with zero.
Loading a new image to WordPress with no resizing
You can now create a new image and when you upload it to WordPress the size of the image will remain the same.
I use the free Windows Snipping Tool. In Windows 10 this is located at Windows Accessories > Snipping Tool.
Open the Snipping Tool. Click on New and select the part of the screen you wish to capture.
I generally create a border around the screenshot.
To do this go to Section Tools > Options.
Under the title Selection, make sure that the checkbox “Show selection ink after snips are captured” is ticked.
To the right of the title colour there is a dropdown box for you to select which colour you want the border to be.
Now save your image and load it up to your post.
You will see that when you view the html code for the image that the size of the image defaults to size-full.
Now when the live post is viewed the image retains it full size.