c# itextsharp append pdf: Extract table data from pdf Library software component asp.net winforms windows mvc Introduction%20to%20HTML%20and%20CSS%20v14-part1223

If you're using Int erne t Explo rer, you'll see a menu that looks like this:

Select P ropert ies and then co py the address of the im age fro m the window that pops up. When you're finished, com e

back to the CodeRunner® Edito r and replace ht t ps://o reillyschool.com/im ages/OST_Lo go.gif with the image

address you jus t copied. (Paste it using Ct rl+V (PC) o r Comm and+V (Mac).)

You can practice using this image:

Keep in mind that .gif, .jpg, and .png images are the only types that can be displayed o n all bro wsers. If you want to

display an image of ano ther type (like .bmp, for instance), you'll need to convert the im age to a valid type using

software like Adobe Photoshop or Paint Shop Pro.

What Kind of Image Should You Use?

GIF wo rks best for images with just a few solid colors and line drawings, like logos, clip art, and small text in images .

One really nice feature o f GIF im ages is that they suppo rt trans parency, so the backgro und co lor will s how through and

you can place the image over another element in your page fo r interes ting effects. GIF images can be compressed, but

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they are a lossless form at, meaning no information is thrown away in compres sion.

JPEG (or JPG) images work best for photos—images with a lot of different co lors and no text. JPEG images can

represent a lot m ore co lors than GIF (16 millio n instead of 256 ), so yo u'll get richer co lor. JPEG is a lossy format,

meaning that when you compress images, you lose so me info rmation. However, for the web, it's unlikely anyone will

notice unless they're viewing yo ur images at very high resolution, which isn't advised anyway becaus e the im ages

would be so large. JPEG does not support transparency, so you aren't able to use them like GIFs to create effects

where you see the background behind the image.

PNG is an image format that was designed to be a better version of GIF. The format is best us ed where you'd use a

GIF—it s upports transparency and represents lines and text well—but also can repres ent a lo t more colors than GIF.

Be careful when using PNG tho ugh, because PNG images tend to be large as a result of their greater depth o f color

(you may want to stick with JPEG for photos).

When yo u save an image for the web, it's a goo d idea to save the image in the size yo u plan to use o n the page. So,

for exam ple, do n't save an image at 80 0 pixels wide by 600 pixels high if you know yo u'll only need a 200x150 image

on the web page. You can reduce the file size o f an image by reducing its width and height. This reduction is s ize also

means your images will load faster!

Uploading Images to Your OST Account

Note

As you work through the next sectio n, if you decide to use an image other than the one we've provided,

be s ure to choose an image that do es not violate copyright laws. A quick s earch fo r public domain

images or creat ive comm ons im ages s hould do the trick!

You can display images from o ther locations o n your o wn page by linking to them using abso lute URLs. You can als o

upload images (or any other file that is saved o n your computer) to yo ur OST account, and link to them using relative

URLs instead.

Let's save an im age that we can then upload to your account. Right-click on the image of the dog (Tilla) below and

you'll see the same menu from before. Select S ave Im age As/Save P ict ure As and save the image to your

computer (make a note of the lo cation where you save it).

Next, select your /ht mlcss1 folder and click File | Add in the CodeRunner® File Bro wser window o n the left:

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Find Tilla.JPG and do uble-click it. Tilla.JPG appears in the Add field. Click the Uplo ad icon:

(To clear the file from the Add m enu, click the red "X").

Now that you have an im age uploaded to your account, let's us e it in a page. Open yo ur pet s.ht ml from the last

lesson, and mo dify it as shown:

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CODE TO TYPE:

<!doctype html>

<html>

<head>

<style>

a {

color: #990000;

}

</style>

</head>

<body>

<p>

I have a dog and three cats:

</p>

<ul>

Tilla Mighty Lupa</a>

</li>

<li>Pickles</li>

<li>Annie</li>

</ul>

<h1>Tilla</h1>

<p>

Tilla is my dog. She is a rescue dog, so I don't know what kind

of mix she is, but she's extremely cute and very loving and sweet.

</p>

<p>

And she can run like the wind!

</p>

<p>

Search for pets on <a href="http://www.google.com" title="Google search engine">Goo

gle</a>.

</p>

Tilla is my awesome dog!

</div>

</body>

</html>

Click

. Yo u'll see your page with the image of Tilla in it.

Styling Images

You may have noticed that the image o f Tilla is to the left of the paragraph that it's in, and that the text o f the paragraph

is aligned with the botto m of the image. Also, the paragraph after the o ne containing the image appears below the

image. Can you think o f why our image and text are formatted like this?

Remem ber that we have inline display and block display elements. The <img> element is an inline dis play element, s o

it flows the image content in with the text of the paragraph in which it is contained. And of cours e, since <p> is a block

display element, the co ntent of the seco nd paragraph m ust go below the first, including the im age.

We can use CSS to have some control over where our images appear, as well as how they appear in the page. Let's

begin by aligning the text of the paragraph it's in with the top of the image instead of the bottom . Modify pet s.ht ml as

shown:

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CODE TO TYPE:

<!doctype html>

<html>

<head>

<style>

img {

vertical-align: top;

}

</style>

</head>

<body>

<p>

I have a dog and three cats:

</p>

<ul>

<li>Tilla Mighty Lupa</li>

<li>Pickles</li>

<li>Annie</li>

</ul>

<h1>Tilla</h1>

<p>

Tilla is my dog. She is a rescue dog, so I don't know what kind

of mix she is, but she's extremely cute and very loving and sweet.

</p>

<p>

And she can run like the wind!

</p>

</body>

</html>

Click

. The text in the paragraph next to the image is now aligned with the top o f the image instead of the

bottom. Try middle too .

So, what if you want the image over to the right instead of on the left? Let's try to make that happen. Modify pe t s.ht m l

as shown:

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CODE TO TYPE:

<!doctype html>

<html>

<head>

<style>

img {

float: right;

vertical-align: top;

}

</style>

</head>

<body>

<p>

I have a dog and three cats:

</p>

<ul>

<li>Tilla Mighty Lupa</li>

<li>Pickles</li>

<li>Annie</li>

</ul>

<h1>Tilla</h1>

<p>

Tilla is my dog. She is a rescue dog, so I don't know what kind

of mix she is, but she's extremely cute and very loving and sweet.

</p>

<p>

And she can run like the wind!

</p>

</body>

</html>

Click

. Now the image should be over o n the right. But you should also see that all of the text, not just

the text of the one paragraph, is to the left of the image. That's because f loat takes the image out of the norm al inline

flow and "floats " the im age elem ent beside the other co ntent o f the element in which the image is contained.

Now, let's add a border to the im age. Modify pe t s.ht m l again, as sho wn:

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CODE TO TYPE:

<!doctype html>

<html>

<head>

<style>

img {

float: right;

vertical-align: top;

border: 5px solid black;

}

</style>

</head>

<body>

<p>

I have a dog and three cats:

</p>

<ul>

<li>Tilla Mighty Lupa</li>

<li>Pickles</li>

<li>Annie</li>

</ul>

<h1>Tilla</h1>

<p>

Tilla is my dog. She is a rescue dog, so I don't know what kind

of mix she is, but she's extremely cute and very loving and sweet.

</p>

<p>

And she can run like the wind!

</p>

</body>

</html>

Click

. Do you see a border? We used a CSS shortcut to combine three properties into one:

OBSERVE:

border-width: 5px;

border-style: solid;

border-color: black;

When yo u write it using the sho rtcut, it's important that you get the order right—width first, then style, then colo r.

The width is specified in px, or pixels. Other styles you can use include dotted, dashed, ridge, inset, and groove. The

color is either a named color o r a hexadecimal code fo r the red, green, and blue elem ents of a color. Go ahead and

experim ent with your im age, changing s izes, s tyles, and colors .

We'll start with s ize here. Even though this image is 40 0px by 300px, you might want to display it at, s ay, 150 px wide.

We can change the display size of an im age like this:

CODE TO TYPE:

<!doctype html>

<html>

<head>

<style>

img {

float: right;

vertical-align: top;

border: 5px solid black;

width: 150px;

}

</style>

</head>

<body>

<p>

I have a dog and three cats:

</p>

<ul>

<li>Tilla Mighty Lupa</li>

<li>Pickles</li>

<li>Annie</li>

</ul>

<h1>Tilla</h1>

<p>

Tilla is my dog. She is a rescue dog, so I don't know what kind

of mix she is, but she's extremely cute and very loving and sweet.

</p>

<p>

And she can run like the wind!

</p>

</body>

</html>

Click

. Did you s ee the im age reduce in size a bit on the page? Keep in mind that even though the image

looks like it's sm aller, it's still fro m the s ame im age file, just res ized by the bro wser when it dis plays the page. This

means the browser has to do m ore wo rk (not m uch, but a little), and it's still loading the same-sized image file. If you

make a big change to im age siz e, then you'll want to resize it using an image manipulation program like Ado be

Photoshop or Paint Sho p Pro. But tweaking the size a little using CSS is fine.

Did you notice that we s et only the width of the image in CSS? We can let CSS figure o ut the right height for the image

to keep the image aspect ratio correct (which s aves yo u a bit o f time trying to figure out what height go es with a width of

150px). Try a few other widths. Also try changing both widt h and height .

The alt Attribute

So, what if the im age do esn't lo ad, or a user has images turned off or is visually impaired and is using a screen

reader? If the im age do esn't load, you'll see a broken image icon; many brows ers als o display the text in the alt

attribute, which can help the user to understand what yo ur image was m eant to convey. Let's add an alt attribute to our

image o f Tilla. Modify yo ur code as sho wn:

CODE TO TYPE:

<!doctype html>

<html>

<head>

<style>

img {

float: right;

vertical-align: top;

border: 5px solid black;

width: 150px;

}

</style>

</head>

<body>

<p>

I have a dog and three cats:

</p>

<ul>

<li>Tilla Mighty Lupa</li>

<li>Pickles</li>

<li>Annie</li>

</ul>

<h1>Tilla</h1>

<p>

Tilla is my dog. She is a rescue dog, so I don't know what kind

of mix she is, but she's extremely cute and very loving and sweet.

</p>

<p>

And she can run like the wind!

</p>

</body>

</html>

Click

. Because we changed the JPG extension to be lo wercas e, the browser can't find the image of

Tilla and displays the alt text.

Using Images as Links

On occasion, yo u may want to use an image in a link. To do that, you'll use the <a> element and then use the image as

the content of the element (that is, put the image between the o pening <a> tag and clos ing </a> tag). Let's add a link to

a Google search for "do gs," so that when you click on the image of Tilla, you get taken to Goo gle. Mo dify your code as

shown:

CODE TO TYPE:

<!doctype html>

<html>

<head>

<style>

img {

float: right;

vertical-align: top;

border: 5px solid black;

}

</style>

</head>

<body>

<p>

I have a dog and three cats:

</p>

<ul>

<li>Tilla Mighty Lupa</li>

<li>Pickles</li>

<li>Annie</li>

</ul>

<h1>Tilla</h1>

<p>

<a href="http://google.com/?q=dogs"><img src="Tilla.JPG" alt="Tilla, the awesome do

g!"></a>

Tilla is my dog. She is a rescue dog, so I don't know what kind

of mix she is, but she's extremely cute and very loving and sweet.

</p>

<p>

And she can run like the wind!

</p>

</body>

</html>

Click

and click the picture of Tilla. You could als o use this kind of linking to pro vide a link to a larger

version of the im age.

Putting an Image in the Background

Now let's try to use an image fo r the background of our web page. As you might've guessed, you do this using a CSS

property.

Save the image below (right-click the im age and save to your computer), and upload it to your OST account (s elect

your /ht mlcss1 folder in the File Brows er's, select File | Add, select your image, click Upload, and then click the red X

to dism iss):

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