Photoshop basic tools

The Crop Tool : This tool allows you to choose your selected size this can be done in inches and can be a certain size or dragged and dropped into the correct size. This would usually be used to fit the size of the photo needed.

The constraint proportions: This is basically the size of the original image and the image size that you have changed it to this makes the photo straight and appear unstreched into the choosen space.

DPI: The dpi is the resolution of the image this can be dependant on the amount of pixels in the image. The suggested measurements are 300p if is a print out of a photo as this is what is needed for a large image and takes up a lot of space.If you are putting it online 72p is all that is needed as the file type appears small and the less detail is needed.

De saturation: This can be the process of changing the colour if this is applying a tint or changing an image to black and white  this can be done using the basic black and white but also by applying the greyscale allowing you to change certain colours.

Curves/Brightness: This is simple as all you need is to change the highlights and shadows of an image you can do this by adjusting the contrast .

Contrast : The contrast is the difference between the light and shadow of an image making one section appear lighter .

Will update with image as there are technical issues with putting them on my blog.