I recently started building WordPress websites and I am a little puzzled when it comes to dimensions of photos/banners etc. I am currently working on a template which has a huge photo at the top of the page and the person I am building the website for wants his photo on it instead of the stock one obviously. I need to understand how to determine what resolution the photo has to be and if there are other parameters I need to follow in order to always know the size of the desired photo.
You can find the photo of the DJ at the top of this page: Click Here
Also, if you scroll down a little you can see the banner where on top there are links (See Bellow). I was wondering how I find the resolution of that too, I am pretty sure it is a separate image which compliments the colors of the photo above to make it seem like a single object. I cropped it out and pasted it below (I didn't crop it perfectly that's why you see the white line below the banner) Hope you can help.