Adobe Photoshop Touch
It is compatible with a range of Android devices such as smartphones and tablets.
There is a tablet-optimised version of the app available. This gives a much better user experience than using an app designed for a phone on a tablet.
It is compatible with a range of iOS devices such as iPhones, iPads and the iPod Touch.
This can be used to rotate the image for an interesting effect, or more commonly to correct the image if it is at a slight angle.
Adjusting tonal curves allows you to selectively adjust the exposure and contrast within an image.
Adjusting the contrast affects the difference between light and dark areas of the image. You can fine tune it to meet your needs, such as increasing the contrast to make your subject stand out more.
With manual white balance you can choose the most accurate setting and avoid the green, blue or red hue which can occur in auto mode. You can also change the setting for artistic effect.
Using selective adjustment points, you can change the settings (such as saturation, brightness, etc.) of a particular part of the image. This is useful if you wish to edit certain areas without changing the whole photo - for instance, if you wish to increase the color intensity of an object in the image.
If your photo is too bright or dark, you can adjust the brightness in order to get a well-balanced image.
You can add an HDR-style effect to the image, whereby the darker areas appear brighter and the bright areas appear darker - giving your image more dynamic range. This gives you an image which looks more akin to how the human eye sees it, rather than a camera.
Image sharpening tools emphasize the edges within an image. This can be applied to a blurred image to make it appear sharper and more detailed.
You can add captions and titles to your photos.
Using the brush tool you can paint across the image, or use it to make small adjustments to touch up the image.
You can build up an image using layers, adjusting the settings for each one independently. This is a sign of a more powerful image-editing app, and allows you to create more complex images.