Week Five: Review Questions

Kathryn Fletcher, kfletche.geo@yahoo.com 

1. What steps would you take to colorize a gray-scale image?

To create a duotone image, first increase color depth to 24 bits. Then use the Colors > Colorize command to add color and adjust saturation. For instance, you could create a sepia-toned image using this technique. Here I set hue to 16 and saturation to 58.

Another alternative is to load an existing palette to swap colors - you'd get colors but some wild effects depending on the palette you chose. (Colors > Load Palette)

Here, I used the autumn.pal palette that comes with Paint Shop Pro.

Another way to add color to a grayscale image is to leave the image at 256 colors and edit the palette manually (Colors > Edit Palette). Change each shade of gray to a color of choice. Another way to get wild effects.

Here I chose colors at random and left several grays alone. 

2. When you choose Edit | Masks, why can you only select from white, black and grays? 

You are working with a greyscale palette as you are using white to remove masking, black to add masking, and shades of grey to indicate some degree of masking.

3. How would you save a mask with the image?

Use the command Masks > Save as Alpha Channel and the mask will be saved as a greyscale bitmap within the image. Be sure to save the file you are editing as a PSP file as Paint Shop Pro saves alpha channels within the image.

4. Describe one advantage of using masks with layers? 

You can choose to display only the layer with the mask and edit it easily without the other layers there to confuse you. You can also delete the layer with the mask if you change your mind about using the mask.

5. What is the advantage of using Gamma Correction over adjusting the brightness and contrast in an image?

You can choose to adjust the amount of red, green, or blue separately - giving you more control over the process. It can allow you to keep the shadows intact and will give you a crisper image that will print better.

 

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