How Do I Make Colour Bars?

To make a colour bar, change the mode to the Indexed Colour. The procedure to make the Mode to Indexed colour is first you select the image, then you select the mode and finally from the mode click on to indexed. Then choose the colour table under the image. For this, you need to go to the mode and then select the Spectrum table. Now to pseudocolor the grayscale image, you need to change the mode to Indexed Colour. Then you choose the colour table in the image. Then choose the gradient tool from the toolbar. Now, drag the cursor from one end of the file to the other end. Now the gradient from the black to white will be created along with all the values. Change the mode to Indexed Colour. Then choose the pseudocolor and the colour table to gradient.

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