Find and then Resizing Images - in Photoshop.

First - how to find the image size in Google Images.

When in Google Images, search for what images you need.

On the thumbnails page run the mouse over the thumbnail image and on the bottom left the image size will appear in pixels.

If the image is more than 480px you can use it, but not less.

Then click on the image for the full size image and then save that image (not the thumbnail) to your website folder.

Resizing the Images.

Open Photoshop.

Open all the images.

If necessary change the Image Measurement to Pixels.

Select Image/Image Size and resize the image width to 480. The height will also change accordingly. But ensure the Constrained Proportions chain is on. See below:

 

Save the resized image and overwrite the original. Make sure your image is saved to your website folder. Resize all your website images, then save them, overwriting the originals.