" Take any TIFF or JPEG image and open it in Photoshop Elements. Convert it to 16 bits per channel. Go to Image> Adjustments> Curves and make a curve".
My first problem was that when I opened Photoshop Elements that it would not allow me to convert to 16 bits per channel, it would only offer 8 bits per channel. In the end I downloaded a free trial of CS6 which luckily worked.
The image I chose was one I had used for a previous project producing a portrait. shown below is the original image.
I selected my image and then followed the instructions. The image then appeared as shown below.
As you can see the linear image here the tones are mainly squashed to the left pf the histogram.
I have then tried to create a curve using the linear image to try and make the image as close as possible to the original version. My best attempt at this is shown below.
Carrying out this exercise has shown me how a digital camera sensor captures an image in a basic 'linear' way and then converts it into the image that we see.
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