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Image Optimization and Saving For Web
7:18Prepare and Export your graphics for web with a focus on Raster Graphics.
Now, what we wanna do is prepare
our site and export for web.
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Image optimization is important because
when you are loading websites into your
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browser, images often take
up the most space, by far.
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It can greatly effect your page load time.
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Often too, these images take up the most
screen real estate on your website.
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So, it's important that they
look crisp and are high quality.
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That's what image optimization is all
about, finding the balance between
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keeping the file size small while
still having a high quality image.
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Different file types
are sometimes better for
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different images depending
on their unique properties.
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We want to export a few images.
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We're gonna start with our mobile
artboard because most of this is gonna be
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replicated in CSS.
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We only need to save specific
parts of the document.
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In this case,
we're gonna isolate our raster images.
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So let's start here on the mobile side.
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And we're going to be
using the Slice Tool,
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Shift + K, and
we will just begin to draw boxes.
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Around our images, and
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this can be a little tricky cuz
you have to line it up exactly.
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And you wanna be careful
that everything is right on.
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You can see I'm off on all sides here.
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[LAUGH] So it's better to zoom in.
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With the Selection tool,
you can adjust your slices.
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Here we are.
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So that's how that works.
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We can have as many slices as we like.
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What it's doing is it's cutting
your image in to pieces.
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Sort of reminiscent of tables.
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It's what it used to be for.
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[SOUND]
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Okay.
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And we'll do one more.
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Not like that.
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And you may have already saved
this out of Photoshop and
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you wouldn't need to do this.
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This is just a way to do it.
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We are going to, I am gonna show you
another way to export images later on.
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So there are multiple ways to export
raster graphics out of Illustrator.
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So now that we have our
slices selected here.
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Or created, I guess I should say.
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We'll go to File, Save for Web, And this
brings up our Save for Web dialog box.
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It's showing us the Optimized.
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We wanna choose 2-Up.
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So on our left-hand side,
this is the original file.
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It tells you the original file size, here.
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And then on the right-hand side,
this is the optimized version.
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We’re only going to be
saving the selected slices.
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So I wanna make sure that I'm selecting
all of my images at one time.
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One, two, three.
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So what's nice is,
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we're gonna be able to save all of
these images out at one time, as well.
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So with these selected,
let's go over here on our right hand side,
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and look at the different presets we have.
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So I'm gonna start with a GIF.
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And you can see, as I zoom in,
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that the GIF file is not really
handling this image very well.
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GIFs are good for
simple graphics with areas of solid color.
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Like icons, logos or decorative elements.
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So something like these.
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This would be good for a GIF actually,
that's a good example.
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Not so much a photograph.
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GIFs do support,
they have one transparent color.
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So if you needed a transparent color and
it did not have a drop shadow.
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A GIF might be a good solution,
GIFs are also good for animation.
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I'm gonna try a PNG-8.
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That didn't change it very much.
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And can also see in the optimized window
it is telling us the file size here.
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PNGs, we'll try PNG 24 as well.
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Oh yeah, see that's looking better.
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Wow, look at that jump in file size.
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It went from
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289.5 in the PNG 8, to 860 in PNG 24.
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PNGs support a drop shadow, so
they are becoming more and more common.
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You will also notice a difference,
we have many more colors in PNG-24
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vs PNG-8, and
the extra colors make a big difference.
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It's the easiest way to get your file
size smaller is to have fewer colors.
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So if we go to JPEG.
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JPEG is the most commonly used format for
photographs like this one,
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and we can adjust the quality here.
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We have low, which you can see.
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We're losing a lot of information so
that's way too much.
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[LAUGH] Medium.
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It's still not great.
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High.
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That might do it.
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You can see our file size is
a really nice small size down here.
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It's much better.
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The JPEG is the clear winner
in quality and file size.
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And typically, JPEGs can achieve
ten to one compression with little
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perceptible loss in image quality,
so that's always a good go-to.
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And remember that for export,
we're not exporting all slices.
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We're gonna be exporting selected slices.
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And we selected just the images,
so that's all we want.
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We'll hit Save.
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I save it to my Desktop.
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Let's go and take a look.
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And what it's done here is it
has saved it in my Image folder.
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This is my finished mock-up.
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And it has numbered them for me as well.
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So here we go.
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This is 46 kilobytes,
36 kilobytes, and 42 kilobytes.
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So it was adding it all together
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in that optimized window to tell
me the full size of all of those.
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These are my images from earlier.
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These are the ones that we just created.
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You can see how fast that was.
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I mean it does take a little
time to adjust to your sizes.
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But once you've done that, it's pretty
straight forward exporting it out.
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And that's it for now.
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Next we're going to talk about
how to save out the SPGs.
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