Here are just a few advantages Illustrator has over Photoshop for vector drawing.
· Selecting shapes
In Illustrator, the interface for selecting vectors within a document is highly streamlined. You can group a collection of shapes, or even a collection of groups, and then grab any combination of them using the group selection tool. In Photoshop, you’d use a combination of selection tools, the Layers palette and the Paths palette to do the same thing.
· Pathfinder
The pathfinder toolbar lets you modify shapes using other shapes. Photoshop includes the basic shape modes (add, subtract, intersect, exclude) but Illustrator adds more complicated methods like divide, trim, merge, and crop. I use these frequently to turn combinations of simple shapes into (for example) geometrically-inspired logos.
· Changing colors
Photoshop has pretty sophisticated coloring tools, many of which Illustrator doesn’t even try to mimic, but one thing it doesn’t let you do is easily change the color of an entire shape or set of shapes. In Illustrator, you can either drag a swatch onto a shape, or select a shape and click the color you want it to be. You can even select all shapes by their color and change every blue in your document to a red.
· Warp
Illustrator’s Warp filter lets you non-destructively change the shape of a vector. Usually this means turning a box or a circle into a shape it would be difficult to draw by hand (say, a flag or a teardrop). I use this a lot for logo design, and I’m not sure if there’s a Photoshop equivalent — there certainly isn’t one that’s as easy to use.
· Pixel Preview / Pixel align
Traditionally, you’re used to seeing pixels in Photoshop and smooth vectors in Illustrator. As of CS5, Illustrator allows you to view and edit your vectors in Pixel Preview mode, to see how they will look on the Web. This lets you spot where your fractional pixel widths might cause fuzzy edges and distortion so that you can fix them on the fly. Plus, there’s the Align to Pixel option that shuffles your vector around to make the edges smooth (not an exact science, unfortunately). I use this feature when making iOS tab bar icons, and it’s probably saved me days of work all by itself.
· Perspective grid
Another new CS5 feature, the perspective grid is a tremendous aid to drawing images with depth. You get to set up a grid in 2-or 3-point perspective, and then draw shapes as usual. Illustrator will force a perspective on what you draw: rectangles elongated toward the horizon, right-angles become obtuse, evenly-spaced objects foreshorten, all for free.
· Color Guide
Lets you adjust all the selected colors in your document at once. For example, you could make all your blues slightly greener, or less saturated, or exchange one color for its counterpart on the color wheel. It does a lot of other stuff too, but this alone is worth the price of admission. Photoshop does this as well (for example the Selective Color or H/S/B tools), but not as elegantly or precisely, and not as quickly.
· Offset Path
Creates a similar version of a shape that fits neatly over another shape such that the space between their edges is always the same. Huh? It’s hard to explain, but very useful, trust me. In Photoshop, I suppose you’d do this by selecting your shape, contracting the selection, and converting the selection back to a vector, but in Illustrator it’s a 1-step process.
· Extrude / Bevel
Lets you make simple 3d representations of a shape. Turns a square into a cube, and lets you rotate it and apply some simple lighting effects. Photoshop may have some equivalent feature, but all of its 3D features require a dedicated graphics card, which is probably overkill for most users.
· The canvas
Imagine a tabletop with a piece of paper on it. In Illustrator, the piece of paper is your Artboard, the document you’ll give to clients, and the tabletop is your Canvas. Since the canvas isn’t part of the final illustration (it doesn’t need to be printed or exported by default) you can use it to keep reference images and alternate versions of the shapes on your artboard. Does that make sense? It’s like a scratchpad. This is a great way to work, and something Photoshop doesn’t support at all.
· Live Trace
Automagicaly converts raster images (like photographs) into an approximation of the same image in a vector version. It’s not perfect, but it’s a very slick feature that a lot of people were asking for before it was included in Illustrator CS2. There’s nothing even close to this in Photoshop. I think Photoshop would be scared to even try something this crazy.
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