631793

Serif WebPlus 8 Manual

52
Zoom out
Zoom in
Previous page
1/92
Next page
52 Working with Graphics, Animation, and Multimedia
Bear in mind that not all your visitors’ computers will match your own
for speed or graphic display. Like the .GIF format, some monitors are
still limited to 256 colors. It’s generally a good idea to switch your
display to 256 colors and test the page in a browser before finally
publishing it. This will ensure you’re using colors in a way that won't
present problems when displayed on average systems. The more you
know about color palettes and image formats, the fewer display
problems are likely to creep in.
Note: If you’re quite sure all your intended visitors can display more
than 256 colors, the following section isn’t required reading. On the
other hand, the knowledge is likely to prove useful when working with
any on-screen graphics, just as knowing basic color theory serves you
in the realm of printed publications.
A major constraint imposed by 256-color systems is that not all
systems use the same 256 colors. The operating system reserves a
certain number of palette slots for “system colors,” and system palettes
differ, for example, between Windows and Macintosh computers.
Applications, including Web browsers, declare their own palettes and
use dithering to approximate colors outside that palette. This means,
for example, alternating pixels of red and blue (from within the palette)
to approximate a purple color outside the palette.
If you’re not careful, dithering can ruin your best efforts. Let’s say
you’ve created a graphic with some solid color areas, but the user’s
browser can’t display one of those colors. So the browser dithers the
color, resulting in a mottled and degraded image. If the solid color
happened to include text, the text becomes less legible.
To prevent display of this kind, Web designers often use a Web-safe
palette of 216 colors that don’t dither in Web browsers operating in
256-color environments. The safe palette is actually a 6x6x6 RGB
“color cube” using evenly-spaced red, green, and blue values from 0 to
255 along its axes. 51 happens to be the interval in the series of values
(0, 51, 102, 153, 204, 255). So, for example, the RGB definition
“0,102,51” would be a safe color, while “0,102,52” would not. To
create Web-safe colors in a paint program, define new colors using
RGB values that are either 0 or divisible by 51.
… 52 …


Need help? Post your question in this forum.

Forumrules


Report abuse

Libble takes abuse of its services very seriously. We're committed to dealing with such abuse according to the laws in your country of residence. When you submit a report, we'll investigate it and take the appropriate action. We'll get back to you only if we require additional details or have more information to share.

Product:

For example, Anti-Semitic content, racist content, or material that could result in a violent physical act.

For example, a credit card number, a personal identification number, or an unlisted home address. Note that email addresses and full names are not considered private information.

Forumrules

To achieve meaningful questions, we apply the following rules:

Register

Register getting emails for Serif WebPlus 8 at:


You will receive an email to register for one or both of the options.


Get your user manual by e-mail

Enter your email address to receive the manual of Serif WebPlus 8 in the language / languages: English as an attachment in your email.

The manual is 0,57 mb in size.

 

You will receive the manual in your email within minutes. If you have not received an email, then probably have entered the wrong email address or your mailbox is too full. In addition, it may be that your ISP may have a maximum size for emails to receive.

The manual is sent by email. Check your email

If you have not received an email with the manual within fifteen minutes, it may be that you have a entered a wrong email address or that your ISP has set a maximum size to receive email that is smaller than the size of the manual.

The email address you have provided is not correct.

Please check the email address and correct it.

Your question is posted on this page

Would you like to receive an email when new answers and questions are posted? Please enter your email address.



Info