Adobe Systems released Adobe Photoshop Express v1.5 earlier today, which now supports the Retina display, offers full background multitasking, and has become even more streamlined. Unfortunately for some, Adobe’s feature additions don’t come entirely free. Anyone looking to use the latest Photoshop Express will also need the latest iOS.

Of course, support for Apple’s much higher pixel density Retina display will make images look that much sharper when editing and even quicker and simpler image importing and photo capturing is always welcome, but what can Adobe do with background tasks? If you happen to be uploading a large photo to one of the sharing destinations, you no longer need to remain in the app until it is finished. Feel free to switch to another task and come back when things are finished.

The Photoshop Express iOS app provides most of the same basic image manipulation available using the online Photoshop Express Editor. Photoshop Express v1.5 features:

• Import: Photo library or Camera: including full support for both front and rear cameras, LED flash, tap-to-focus, and zoom (iDevice dependent)
• Transform: Crop, Straighten, Rotate, and Flip
• Adjustments: Exposure, Saturation, Tint, Black & White, and Contrast
• Effects: Vibrant, Pop, Vignette Blur, Warm vintage, Rainbow, White Glow, and Soft Black & White
• Borders: Rectangle, Rounded, Oval, Soft Edge, Vignette, Rough Edge, Halftone, and Film Emulsion
• Upload: Facebook, TwitPic, and Photoshop.com (free account registration required)

Former users of the app should note that the new features have vastly increased the minimum required iOS version. Do not update Adobe Photoshop Express in iTunes if your iDevice is not running the latest iOS version. The freely downloaded Adobe Photoshop Express is a universal app compatible with iPad, iPhone, and iPod touch running iOS 4.2 or later.