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05-07-2011, 03:19 AM #1
Adobe Photoshop Complete Course | Lecture 27
8. Now the image file will only occupy 35 KB, which is much better for web use:
9. But what about the picture quality? See for yourself, if you can accept it. The details are more blurred (see Figure 25), but that is not so significant when the picture is for web use. The viewers do not expect top quality; rapid opening of the image file is more important.
10. We accept quality 30. Click on the Save button:
11. That opens the dialog box Save Optimized As. Name the file plys_pat2.jpg, and save it in your work folder:
12. Now you have saved a version of the teddy bear picture. You need to make one more. Use the Layers palette to hide the layer pattern 2 (remove the eye):
13. Then you see the teddy bear on a flower field (with the background pattern 1 visible). This picture needs to saved for web also.
14. Do that yourself; use JPEG quallity 30, and name the image file plys_pat1.jpg.
15. Finaly close the file with Control+4 â€“ now we are finished with the teddy bear for this time.
Figure 25. You get a blur in the picture detail when the JPEG compression is increased.
15. The Extract tool
Let us return to the main subject for this part of the booklet, which is selection and free scraping. Now we will introduce you to a new tool; that is Extract.
Extract is not a traditional selection tool like the lasso. Extract works in quite a different way, but the function is a good all-round tool for free scraping especially in motifs with fuzzy edges.
In practice extract works similar to a user firendly combination of a number of other tools (magic wand, lasso, eraser etc.) but yet it is quite different. You will soon learn to highly appreciate this tool. At least it is experienced as more â€calmâ€ and less â€stressingâ€ to make a larger selection with Extract as compared to various lassos.
Introduction to Extract
In this exercise you will try to use the Extract tool on a relatively large figure, which would be laborious to scrape free with a lasso tool. The figure works easily with Extract, since it has well defined edges.
1. On the home page for this booklet you can find the picture sapiens1.jpg. Retrieve that and open it in Photoshop. Save the picture right away as sapiens1.psd.
2. This is an old anatomical drawing. The body now has to be scraped free. Choose menu items Filter --> Extract. That opens a large dialog box:
3. In the left side of the dialog box you see a number of different tools, which you use for the extraction (see Figure 26).
4. The individual tools can be set in the right side (or in some instances from the keyboard).
5. Now select to zoom ind so you see the head in a good enlargement. You can use the Zoom tool (click with the magnifying glass), or you can press Control++ a couple of times, until you get suitably cose in.
6. Use also the hand tool (mouse drag with the space bar) to navigate in the picture, so you see the head. The exercise continues in the next section.
Figure 26. The Extract function has a number of tools, each of which can be activated with shortcut letters.
Select the edge
Now you are going to select the whole figure.
1. You have zoomed in on the figureâ€™s head. Select Edge Highlighter Tool in the upper left:
2. Then choose a suitable brush size in the right side of the window. Enter 6 in the Brush Size field:
3. Make sure that you have checked the Smart Highlighting field â€“ that gives the same effect as with the magnetic lasso (see page 45).
4. Now paint calmly along the edge of the figure. It will take some time to get all the way around; but you are in no hurry, and it is not difficult:
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