If somehow HTC Album on your device is displaying pictures or folders as Albums you’d prefer to hide from various reasons, this could be easily achieved with a Registry tweak that instructs HTC Album to ignore a specific folder.

You need to edit your registry by going to HKEY_LOCAL_MACHINESoftwareHTCHTCAlbumIgnored. This is the place where all the folders to be ignored and not displayed in the Album application are stored. Say you have a folder called Project you’d like to hide from the application then create a new string in HKEY_LOCAL_MACHINESoftwareHTCHTCAlbumIgnored and set its name to Project and its value to the path of your folder (i.e.: Storage CardProject). This will hide all subsequent folders as well so make sure to hide only the folder you want to keep from Album application. Add as many string values as you wish.

Note: Additionally, if you want to hide a specific picture, just set its attributes to hidden and it will not be shown in the Album application. Do that for all individual pictures you want to keep from the program.

(Source: XDA Developers)