This guide will show how to dither images using Photoshop. For more information about dithering in general, see Dithering Images.

• Photoshop (the previewed version is CS6)
• Another tool for editing images with transparency (such as Paint.NET, if you're not already skilled with Photoshop)
• RCT2 Pal files (found below)

• With Water - This should be used for any image being drawn in the intro scene, title screen, rollercoaster designer, or track manager as they will never have a different water palette.

• Without Water - This should be used for any image being drawn in a scenario or the scenario editor since the water palette may be different.

• Download the RCT2 pal files.
• Open up your image in Photoshop.
• Transparency needs to be used for the background, otherwise the edges of the image won't look right after being converted.
• If the edges of your image are (or are close to) pure white, you may have a problem when adding transparency to your image.

• Goto Image > Mode > Indexed Color....

• The Indexed Color window will pop up.
• Open the Palette drop-down and select Custom....

• The Color Table window will pop up.
• Click Load to open one of the two pal files you downloaded earlier.
• In the Files of type drop-down select Microsoft Palette(R) (.Pal) and then locate the RCT2 pal file.

• Now you can color your image using dithering.
• You can change the Amount percentage between 1%-100% however somewhere around 50% usually looks best. The image will update as you change the value.
• Click OK when you're done.

• Now you have your image with the correct palette, but there's no transparency.
• I've found adding transparency with Photoshop is more complicated than just using another image editor. So if you know how to do it in Photoshop then go ahead.
• Copy the entire image and paste it in your alternative image editor.
• Next fill in the white background with transparency. This is where problems may occur if the edges of your image were already white.

• And you're done. Save the image in the resources/g2 directory as a numbered png and you're good to go.