Grayscale is another common option and is pretty much exactly what it sounds like-instead of working with colors, you'll be working with shades of gray. It will probably be best to create your image in RGB first and then convert it to CMYK before printing, since your computer will automatically display RGB colors. CMYK Color is another common color mode, but usually only used for printing. This is appropriate for images which will be viewed on a computer, as well as most printed documents. This is one setting which can be changed after the image has been created without too much consequence. Choosing a preset also automatically selects your color mode, but you may need to change it depending on what you're creating. 
The color mode determines how the colors will be calculated and displayed.
Choose a resolution you'll want to keep-you can't increase the resolution later without degrading the image's quality.Ĭhoose your color mode. When creating for the web, focus on dimensions (height and width) rather than ppi-increasing the ppi beyond 72 for a web-based image will not make it look any different in a web browser. Larger files require more processing power from your computer and take longer to download, so avoid 300 ppi unless you'll just be printing the image. 
A higher number of pixels per inch (ppi) will also result in a larger file.X Research source 300 ppi is Adobe's default print resolution. If you plan to print your image and didn't choose one of the Print presets, you'll want to increase the resolution to at least 220 ppi (or 300 ppi for best results). If you chose a blank document preset, just keep the resolution the same unless you know you need to specify it exactly. The more pixels in an inch, the more detailed the image will be. Resolution determines how many pixels will be in one square inch of the image.
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