Ever since the iPhone came out, I’ve been dreaming of a mobile Photoshop app.

This hasn’t happened—yet—but GhostBird Software has managed to get closer than anyone else with PhotoForge.

This amazingly powerful image-editing app can edit photos, apply filters and effects, and provide the tools for you to create illustrations and paintings from scratch.

When you first start up PhotoForge, you choose to either open an existing photo, start with a blank canvas, or take a new picture with the iPhone’s camera. Seven icons across the top of the screen represent the tools you can: Zoom, Brush, Eraser, Paint Bucket, Eye Dropper, Smudge and Clone Stamp. Several options along the bottom of the screen let you select color, transparency, brush size and type; adjust curves; select filters and effects; undo and redo; and save image.

Taking a closer look at some of these tools and options, Zoom lets you get right down to the individual pixels for fine detail work. The Brush tool features eight different brushes ranging from hard- or soft-edged to scattered dots and more, all with unlimited sizes, colors, and transparencies. This really allows you to paint anything you can imagine, providing you have some artistic skills.

The Eraser tool will erase everything except the original photograph, making it possible to erase effects from part of a photograph. For instance, you could use the black-and-white filter and then selectively erase part of it to reveal the colors below, like in a black-and-white picture of a girl holding a bright red rose.

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