Are you unsatisfied with the color scheme of your display? Maybe the colors seem a bit off to you? Well if you didn't know, you can adjust that. You can change the color profile of your iDevice screen the same way that you can with your Mac using one of Ryan Petrich's jailbreak tweaks which has been dubbed Color Profiles. It certainly isn't new, but it's something that seems to have been forgotten in the jailbreak community. With it, you can change the color profile of your screen using either the manual sliders or by selecting a pre-installed color profile. Are the pre-installed color profiles not enough for you? No problem! You can download more in Cydia.
You'll notice that when you install Color Profiles, you are given a new settings cell in the Settings application that lets you change the color profile settings. You will see two sliders, and a button. The button brings you to the menu of pre-installed color profiles that you can toggle for your iDevice. When you download any new color profiles from Cydia, they will also appear in this menu. You can see what the menu looks like in the image below:
Alternatively, you can use it as a type of theme. The color profiles that are built in include numerous color types like grayscale (which makes it appear black and white), and if you're a colorful case user, you can pick a color that looks good with the case. While not the best way to theme your iDevice, it's one way that some people might find this functionality useful for them. I would have to say that perhaps one of the cooler color profiles in this tweak would be the classic Mac profile.
There is even a setting built in that allows you to toggle a color temperature using an Activator action. This allows you to toggle on certain color temperatures or profiles based on your preference by invoking a special Activator action when you want to very easily instead of fiddling with the settings each time you want to change something. You can set up to one color profile per Activator action and they will add up quick, so choose wisely. If lighting conditions go from suddenly very bright to very dark, you can invoke an action to set the color profile to a more preferable color setting so that it will reduce eyestrain and help you read your screen more comfortably.
My favorite part about this tweak is being able to tinker with all of the different kinds of color settings. I like seeing how my photographs and things of that nature appear in them. It could be more of an entertainment value to me, but I think that someone who needs to adjust the iDevice's color scheme will find this tweak useful if that constant bluish glow hurts their eyes later at night. I give this tweak a good rating because it's simply easy to use and does exactly what it's intended to do very well. After installing this tweak there will be no icons added to your home screen; settings will be added to the Settings application. Color Profiles is compatible with iOS 4 and iOS 5.
Sources: Ryan Petrich