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Adobe Photoshop 7 Tutorials
Saving/Printing / JPEG format
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Subtitles of the Movie (Adobe Photoshop 7 / Saving/Printing / JPEG format)
Often if I am working with an Art Director or somebody that might be long distance or just across town, sometimes it's easy simply to email them different versions of my project to get their feedback. And we can talk on the phone while they are looking at the emailed version. Well if I'm going to do that, I'm going to want to create a fairly small version, that is small file size, so it's easy to transmit over my dial-up phone line. And what I might do is choose the JPEG format. Now the JPEG format of course does not support layers. But it doesn't really matter, because I just want my friend or art director to comment on the overall image. So I'm going to choose the JPEG format, and I'll just call it version-4 and take up the word copy. Or you can leave it in: it doesn't really matter. But I always want to make sure that it does have the .jpg suffix. And I'm going to go ahead and click save, and it's going to bring up some options for my JPEG format. Now JPEG is a type of a file format that performs a compression over my image. And there are two types of compression designs. And one of them is called a lossy compression - it will actually throw out image data in favor of creating a smaller file size. And the JPEG format, of course, is a very popular format for the images designed for the World Wide Web, as it creates a very small and highly compressed files. And the other type of format is a loss-less format, and you can choose the LZW format when you save as a TIFF file format. Well since I don't have any transparency, I'm not going to choose a matte color for any transparent areas. But if I did have transparency, or if I was designing something that might be a part of a website, I might want to choose a different matte option. Perhaps the most important option here is the image quality. And you can see that we have various ways of choosing our image quality - you can just type in a value here from one to 12 I believe - yes it goes up to 12. Or we could choose one of the 4 presets. It will just snap to a different level here, or you can just drag this slider up and down. And it's important to have preview enabled, because this way you can see the compression artefacts being introduced when you turn down the image quality slider. At the bottom of the JPEG options dialogue box, there is little informational area that tells me the actual file size that would be generated, when I chose whatever my image quality options are, and how fast it would take to download if it were being served up on a web page with whatever type of connection you choose here. So I'm going to just stick with the 56kbs speed, as that's about the fastest dial up speed most people have. If you have DSL or something faster, you might choose one of these. But since I'm just planning on emailing this or adding this as an email attachment, it really doesn't matter. My general rule of thumb when I send people images through emails is I to try to keep the image size under 100 kilobytes. So with that in mind, I'm going to dial the image quality way down and notice in the background how chunky and bad my image looks at a very low image quality setting. Well, that's really not very good in order for somebody to determine what they are looking at. However, notice it does create a very small file size - about 20 kilobytes in size. Well I'm going to choose somewhere in between - I'll try 6. And six looks pretty good. I think somebody can get the idea here. and I don't really see to many image artefacts in the compressed image. Maybe I might try a little bit higher actually. And that's going to create a file that is a little bit less than 60kilobytes in size, quite a reasonable size to add as an email attachment. Well, let's go ahead and open that up and see how that really looks compared to my original. And here it is, and it looks pretty good. Another thing I want to point out with JPEG compression, is notice when I open my file, it expands to its original flattened file size - about half a megabyte. But compressed, it's a little bit less than 60 kilobytes.
Tutorial Information
| Course: | Adobe Photoshop 7 |
| Author: | Andrew J. Hathaway |
| SKU: | 33329 |
| ISBN: | 1889347272 |
| Release Date: | 2002-09-05 |
| Duration: | 11 hrs / 152 lessons |
| Work Files: |
Yes |
| Captions: | No |
| Compatibility: |
Vista/XP/2000, OS X, Linux QuickTime 7, Flash 8 |
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