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Sat, May 21, 2016 10:46 pm

Using Preview to adjust the colors in an image

When I need to work on a piece of new equipment that has a power adapter, I usually note the model number and part number for the power adapter in case the adapter should be separated from the equipment later, so that I can easily determine which adapter goes with which piece of equipment and so, if a wire within the cord for the adapter gets broken over years of use, I can easily locate a source for a replacement if needed. I sometimes also take a photo of the power adapter, so I know what it looks like if I'm searching through boxes of adapters for the correct one.

So I took some pictures of the adapter for a new HP 15-af131dx notebook. I used a station my wife has in her studio for taking photos that has a white cloth for a backdrop and lights that are focused on the area to be photographed. But I used my cell phone to take the photos rather than the camera she uses. Even though I made some adjustments to the phone's settings for taking photos so that the images had a white background when I viewed them on the phone, when I uploaded them from the phone to a computer I found that the white backdrop looked somewhat gray when I viewed them on a couple of computers.

On my MacBook Pro laptop, I normally use the Preview program, which is found in the Applications directory on OS X systems, to view images. That application provides color adjustment capabilites that allowed me to easily adjust the colors in the image so that I got the whiter background I wanted for the images. After opening a photo in Preview, I could click on Tools then Adjust Color to bring up an Adjust Color window where I could change the following values for an image:

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