HOW I CREATED THE IMAGE BELOW

Well after my topic had been approved, i thought of putting up some pictures of the independent variables. in my case this would be the different brands of energy drinks. To begin with i googled each product and saved the image, the next thing i did was open up the photoshop application on my mac, and opened all the images [they were seen as being in different tabs], i clicked on the first image, then i double clicked on the word background located at the bottom right in the layers tab, in order to turn it into layer 0 [zero]. Immediately after that a pop up will come up, and i clicked "ok". the next thing i did was click layer mask located below the layers tab and is the third from the left. Then i clicked the quick selection tool located on the tool bar and i selected the background. I then right clicked and clicked fill, a pop up will come up, and i clicked "ok". The background should immediately turn into grey and white [checkered and tiled], then i cropped it using the crop tool and saved it as a "gif." file in order to keep its transparency [when saved the checkered background will turn transparent]. I repeated these steps with the rest of the images. Once i was done i copied the images and inserted it into a new on photoshop and saved it as a "gif." file.