Making Graduated filters with gradients> Step 3

In this illustration, the gradient tool's peoperties are shown split into three, so you can see it more easily. Firstly you need to click into the gradient options box, shown here second from the left on the top row. Here you will be able to pick one of several preset gradient alternatives. Pick the Foreground Colour to Transparent gradient. This will enable you to flow colour across your image and fade it out without a sudden jump.

Next, in the Mode menu, shown here on the left of the second row, pick the Multiply option from the pop up menu. This will ensure that your graduated filter covers previously white areas of your image. Next, set the Opacity slider to a weak 40%, so you can apply multiple gradients on top of each other, rather than in one fell swoop.

Finally, check both Dither and Transparency options as shown.

You are now ready to select your gradient colour. If you want merely to make a weak blue sky stronger, then sample the darkest blue tone from your image by using the Dropper tool. Once set as the Foreground colour, you can then double click the Colour Picker, then once open, pick a darker value as shown on the left hand illustration. This will enable you to start with a convincing colour.

If you want to add a completely different colour to your imahes, such as a tobacco or orange colour, go to the Colour Picker straight away.