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Hi.

I have a grayscale image, which has a certain wanted pattern of colours + some unwanted colors.

The colors I want to leave are (rgb):

000

666

121212

181818

242424

303030

363636

424242

As you can see, there's a pattern  Unfortunately there are some really "hard to select" colors also (other's that the previously mentioned, e.g. white and near that). The unwanted colors are actually contours (curves for height changes of the terrain), so they would be really tiresome to edit manually. The image is 2048 x 2048 pixels. The image is for a game engine to create a 3D-map from actual map data. The game engine reads the colors and then creates the terrain (height changes) according to the actual map data. Unfortunately my Photoshop skills left me with an image with the correct areas of the selected number of colors, but also with the unwanted contours

How could I remove the "white" curves and replace those with either colour beside the curve without having to manually "overdraw" all the hundreds of curves? :/ Actually, this is just a start as the real challenges have way more curves the map size being much bigger.

All the gurus out there, I need your help!

Link to image (bmp):

https://onedrive.live.com/redir?resid=C769995EB0B2279B!43275&authkey=!AKcPZK-UZ5mHle4&v=3&ithint=photo%2cbmp