Graphics Programs Reference
In-Depth Information
1
Choose File > Open. In the dialog box that appears, browse to the advps10lessons folder and open the
file named
advps1004.psd
. A colorful logo appears.
The logo you will optimize.
This logo contains a large amount of solid color, and has an image behind it. In such situations you
must determine the part of the image on which you want to focus; in this case, you will focus on the
logo type, not the image behind it.
You will now remove the background. When you have a solid background, you can remove it using
the Magic Eraser tool, which has a tolerance option to control the pixels to delete to transparency.
2
Select the Magic Eraser tool ( ), which is hidden under the Eraser tool ( ) in the Tools panel.
3
In the Options bar at the top of the window, confirm that the number 32 is in the Tolerance text field.
Also, make sure that the Contiguous option is checked.
Tolerance determines how much of a selected pixel color is deleted when you use the Magic Eraser
tool: the higher the value, the more shades of that color are deleted. The lower the value, the fewer
shades of that color are deleted. Selecting the Contiguous option ensures that only touching pixels are
deleted to transparency.
Click the Contiguous button to select only pixels that are connected to each other.
4
Click the White background. The Background layer converts to Layer 0 and the background becomes
transparent.
5
Choose File > Save as, and in the dialog box that appears, navigate to the advps10lessons folder. Name
the file
advps1004_work
, and keep it in the Photoshop PSD format. Click Save. Keep the file open
for the next part of this lesson.
Optimizing the GIF image
In the following steps, you will determine the best settings for optimizing your GIF image. You will use a
color table to affect the appearance of the final optimized image.
1
With the
advps1004_work
image still open, choose Image > Image Size. In the Image Size dialog
box, change the Width to
200
pixels and click OK.
2
Your image might appear smaller on the screen than it actually is. Double-click the Zoom tool ( ) to
view your image at 100 percent.
