Week 5 – Black and white conversion techniques

There are many different ways of converting colour images to black and white, each with their own disadvantages and benefits. Here I will be looking at a variety of ways in which to do so. Here is the original image I have decided to work with.

Lab Colour

Image>Mode>Lab Color

Here is the out come of converting to black and white by lab colour. By going Image>Mode>Lab Color followed by Image>Adjustments>Desaturate. I then converted the image back to RGB in order to export as a Jpeg.

This time I am going to use a slightly more in depth technique to convert to black and white using the same image as before.

This screenshot displays my image after converting to Lab and selecting the lightness channel from the channels palette. I then converted the image back to greyscale, this uses the info from the lightness channel to build the mono image.

Here I further converted the image back to greyscale then selected the grey channel and inverted the selection. I then added a new fill layer (Layer > New Fill Layer > Solid Colour) filled with solid black. Finally I adjusted the opacity of the fill layer to achieve a fitting amount of strength. Further tonal adjustments etc can be made after this conversion to further enhance the image.

This is the final image I decided upon whilst using the fill layer technique.

Using the same image again I am going to convert the image using a channel mixer adjustment layer. This is a useful technique as it also gives you control over tonal reproduction. Although it is advisable to keep the sum of all the channels to 100%.

Here is the product of converting to black and white using a channel mixer adjustment layer.

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