How Do crop accurately?

hello again - ave question! thank helping me!

i have purchased image shutterstock, , set of 9 seamless images on transparent ground. (attached) how separate each image?i have used grid lines , marquee tool snap crop grid lines, when create pattern fill - there fine lines in repeat, , think have removed 1 side(by pixel!) eps vector file. ( not vetors , rasterizing ets, when open in photoshop, rasterizes. - mean image more set use in illustrator??

 

any , tips appreciated!

thanks

nadia

i think have worked out using magic wand! if there way, though, love find out!

 

thanks again

nadia

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