Adobe Illustrator CS3 Tutorial: 'Everything about Gradients'

'After discussing about Clipping Masks in a previous post, my intention was to start a subject about Opacity Masks, but then, I thought it would be a better idea to talk about Gradients as an introduction to Opacity Masks. I think it's useful anyway...'

A nice Gradient Fill can really make the difference and enhance your artwork. I will try to explain in detail all about Gradients.

An alternative way of coloring an object with a solid fill, is choosing a gradient. A gradient fill consists of more than a single color. It takes a minimum of two colors gradually blending from one to the other.

Ok, let's see all that in action.

So, start Illustrator and create a new document. In the toolbox on the left, select the Rectangle tool , click on the artboard and drag to draw a rectangle with a black stroke and a nice solid green color.

From the right dock, click on the Gradient Panel and click to expand it.

Of course, you can always avoid all this by simply clicking CTRL+F9 on your keyboard.

With the rectangle still selected, click on the small icon on the top left corner of the panel in order to change from the solid green color to a gradient fill. This is the Gradient Fill Box, and displays the current gradient colors and type. By default, the panel includes a start and end color box. Notice that the first time you will click on this icon, the default white to black gradient fill will be applied to your selection.

As you see, the rectangle fill, looking at it from left to right, starts from pure white color and then it gradually blends into shades of grey until it ends up to pitch black. Why is this happening?

Take a look at the Gradient Panel.


Let's focus first on the Type textbox and the Angle textbox. There are two types of Gradients, Linear and Radial. Below I will try to explain the difference between them.

a. Linear Gradient

In a linear gradient the blending of one color to the other takes place along a straight line from one side of the object to the other. In the following images the blending starts from left to right along a straight line.


In this type of gradient, you may also specify the angle of that line, the direction along which the color blending will take place. In the images shown above, the angle is 0 degrees. If you input a value of 45 degrees the result is shown below.


b. Radial Gradient

In a Radial Gradient, color blending starts from the center of the shape and is completed outwards.


Ok, let's go back to the rectangle we started with, so that we explore the Gradient Panel a bit more. At the bottom of the panel, there is a tool called the Gradient Slider. The Gradient Slider adjusts the way the Gradient looks. Underneath the slider bar, you can see two small 'pointers' called Color Stops (the start color and the end color of the Gradient). On the top side of the bar, there is a diamond shaped icon called the Midpoint Indicator. This is an indication of where is the midpoint of the transition from one color to the other.


For demonstration reasons, I undocked the panel and resized it so that its length is equal to my rectangle length.


Ok now, let's see what adjustments we can make to our dull rectangle. Click on the Midpoint Indicator and drag towards the right. You will see that your gradient is adjusted so that the midpoint will be at the new point you defined. You will also notice that as soon as you move the Indicator the Location value box becomes active so that you can precisely place the Midpoint along the Gradient.


Let's see now what happens if we move the Color Stops. Make sure the rectangle is selected, and let's assume we move the white stop towards the right at approximately 20% (shown in the Location box) of the Gradient slider length and the black stop at the 80%. You should have an image similar to the following.


What has actually happened is that the rectangle is now split in 3 zones. In Zone 1, we have solid white color. Then, at 20% of the rectangle length (at point A) is where our gradient starts. It starts from pure white, lasts throughout Zone 2 (it also passes from midpoint at C) and the blending is completed by turning into black at point B (approximately @80%). From this point onwards, we have Zone 3 in which we have pure solid Black color.

Remember we talked earlier about Linear Gradients and how we can adjust the direction of the Gradient by entering an angle in the Angle text box? In order to avoid the fuzz of manually inputing the angles you can simply select the Gradient tool from the left toolbar, and drag accordingly in the document window to set the angle. This is an example of how you do it.

In the previous image, what I actually did by clicking and dragging (on the yellow highlighted spots), was to specify an angle of approx. 34 degrees.

Let's see now what happens if you select the Gradient Tool again, but this time you click outside the shape,drag and release the mouse again outside the rectangle.


In order to fully understand what happens, take a look at the previous image. Given that you clicked on the amber spots, I resized the Gradient Slider to extend from the start point to the end point of the Gradient. The solid white and the solid black regions of my gradient are outside the rectangle, thus not visible. In general, with the gradient tool you can very quickly test many angles to your gradients and choose the best one for your design.

If you are dealing with a radial gradient and you decide to modify it with the gradient tool, then the place you click and start your drag is the center of the gradient. Have a look at the following image.


Let's say we agreed on the direction of the Gradient but we are not satisfied with the boring colors of our gradient so we want to spice things up a bit. What about playing around with the colors?

There are quite a few ways to change the colors of a gradient. A quick one is described below. Open the Swatches Panel. Locate it on the right dock and click on it (or use the top Menu and choose Window > Swatches).

Select the rectangle with the white to black Gradient. Click on a color swatch of your like and drag it on top of one of the color stops, let's say the white.


You could do the same procedure for replacing the black color stop, but I want to show you a different way to change the color. So click on the black color Stop. On the right dock locate and click to open the Color Panel (or simply press F6) . By doing so, you see that the color is solid black. Press SHIFT and click on the ramp at the bottom of the color panel.


This way you' re switching between the available color modes, RGB, CMYK etc. Set it to RGB and pick a color over the right edge of the bar. The result should be something similar to the following.


Of course gradients are not limited just to two colors. You can create gradients consisting of many colors. And it's very easy to do it. Repeat the same procedure like before, but this time drop the color on the slider somewhere between the two initial color stops. The result should be similar to the following image.

As you notice, by adding a new color stop, a Midpoint indicator is also created. So you can precisely adjust the midpoint for every section of the gradient separately (one midpoint indicator for each pair of color stops). You may add as many color stops as you may handle and produce impressive gradients. Try adding a 4th and a 5th color stop to the gradient.


Let's say now that we are happy with all these colors and satisfied with the gradient fill we created for our rectangle. Illustrator offers you the ability to save this gradient's settings and store them as a new color swatch in the Swatches Panel and use it again in the future. Let me show you how.


Click in the Gradient Fill box, drag n' drop in the Swatches Panel and there you go... Your gradient swatch is now available for later reference. Double-click on the swatch icon and in the pop-up window give it a name of your like. I named it 'Rainbow'.


So if you now create a new rectangle or circle, select it and just click on the newly created swatch (rainbow) in the Swatches Panel.


The result is a circle with the gradient fill you created before but you do not have to go through all the procedure of creating the gradient from the very beginning.

In just a snap...

Before you go, check out other interesting tutorials of mine:

• The Stroke Panel
• Everything about Clipping Masks
  
• Selection Tools

Adobe Illustrator CS3 Tutorial: 'Everything about Clipping Masks'

'Sometimes you want to show only part of your artwork, not the whole thing. Deleting portions of your work is not recommended in general especially since illustrator is equipped with a powerful feature called Clipping Masks.'

According to the definition given by Adobe, ''A clipping mask is an object whose shape masks other artwork so that only areas that lie within the shape are visible. I say you can think of a mask like watching a scene - image - illustration through a keyhole. The visible part of the scene is what lies beneath the 'Mask'.

Let me explain what I mean.

So start Illustrator, create a new document and import an image of your like. Select File > Place... from the Menu bar.

At the new window, browse until you locate a picture, let's say, somewhere in your computer so we can experiment with. Select it and click Place.

The photo has now been imported into Illustrator workspace.

Select the rectangle tool from the Toolbox and create a rectangle on top of the photograph similar to the one shown below. This object is called the clipping path.

Select both the rectangle and the photo (if you don't know how... check my tutorial on Selection Tools). From the Menu bar select Object > Clipping Mask > Make.

If you have followed along you should end up with something like the following.

The rule is that the object that stands on top of the stacking order will be used as the mask and the part of the image that lies inside this shape will be visible.

The objects that you mask are moved into the clipping mask’s group in the Layers panel as seen below. (Open the layers panel Windows > Layers, or simply press F7.)


As you see, we managed to keep the ugly car out of our sight. There are two frames with a blue border. The larger border is the outline of the original image. The smaller one is the outline of our clipping mask.

Now, take a look at the top panel. If you have deselected the clipping mask, you will not be able to see this tool bar, so go ahead and just select it again. We will focus on the two available editing modes while working with a clipping mask's group.

Have a look on the left hand side on the control panel. You have two options. You can either edit the 'contents' meaning the original image a portion of which you mask, or you can edit the clipping path itself.

Click on the Edit Clipping Path button . You will see that the only border available is that of the mask. Select the path with the Selection Tool and play around with the size of the rectangle or choose the Direct Selection Tool and adjust individual anchor points and see what happens.

Click on the Edit Contents button and move the original image, thus revealing a different portion of the photograph. This way you can make adjustments concerning the part of the image you want to show every time.

Let's say, that for some reason you do not need the mask anymore. How do you get rid of it? Very simple actually, select the mask, go to Object menu > Clipping Mask > Release...

This way you get the image and the rectangle independent from one another as two separate objects so you can delete the rectangle and move on with your design.

USEFUL TIP

In case you have a rectangular mask in mind, there is an even quicker way to achieve the final result. Place the image, select it and from the top panel and select Mask.

By clicking the Mask button, a rectangular mask is automatically created on top of the image you placed, and you are transferred to the Clipping Mask environment. This automatically generated mask has the exact same dimensions with those of your image.

Now you are in clipping path mode (EXACTLY LIKE SHOWN BEFORE) so all you have to do is picking the selection tool you want and adjust the size and shape of the mask.

Exactly the same result, but much quicker... You do not have to create an extra rectangle on top of the image (to be used as a mask) and then edit its size and shape. Pretty cool.

As you will have probably guessed by now, any kind of shape can be used as a mask.

So roll your actions back and replace the rectangular shape with a star, circle or even Text. Below you can see the result with a star used as my clipping path.

Another useful application of clipping masks is when working with text. Instead of having a 'dull' and not so interesting fill colour, find a smashing image and use it as the text fill. Here is how you do it. Choose a thick Font (I used Franklin Gothic Medium Cond) and write something on top of your image. Select both the text and the image and create the Clipping Mask as explained before.

Furthermore, you can still edit your text like you would normally do (i.e. apply bold style to the text etc). The result can prove quite spectacular and your text may actually make the difference with great fills.

LAYER CLIPPING MASK

Another functionality that offers more flexibility in Illustrator is applying masks within the Layers panel. In brief, you use a layer to mask another layer. Let me show you an example.

Here I created a new document, and placed the same photo (of the doggy...). I opened the Layers Panel and placed it somewhere near my image so that I can easily access it. I went on and created a closed path (in yellow) that contains just the dog drinking water. I left out the car and the background of the image.

My original photo layer contains two elements. The Image element that contains the photograph, and the Path element that contains the yellow outline. My intention is to use this yellow stroked path as my mask so that I can only see what is inside that path. In order to achieve that I am going to use the Layer Mask.

Since it refers to a layer and its contents, you do not have to select anything. All you have to do is click on the Layer that contains the image and the path to select it, and then click on the Make Clipping Mask button shown below.

The result is shown below:

What happened is that the topmost object (clipping path) inside the original photo layer masked everything below it (Image). Now you can move forward with your illustration and create nicer background or add fancier elements in your artwork. Did you decide at a phase of the design that you do not want this layer masking? No problem. Select the layer again and just click the Make Clipping Mask button again. Your masking is gone.

That simple...hope you find it useful!