Is there a way to render background texture with alpha in a webpage? I want to have texture on top of a gradient so I can see through it.
I'm not using canvas for this (although I do use canvas for some other animation effect)
You can achieve that with CSS3 Multiple Backgrounds and CSS3 Gradients. Here is a good article on the subject.
Edit: To clarify, you basically need to just define two backgrounds on the object. First one would be the gradient while the second would be the alpha texture.
You don't need CSS3 for this. Use a seamless background tile on html and an alpha gradient on the body.
html {background: #fff url(path/to/bg-tile.png) repeat 0 0;}
body {background: transparent url(path/to/gradient.png) repeat-x 0 0;}
Multiple background images are not supported in IE<9
You could just use a big div as background and add the gradient and the png inside the div and then use css to resize and position
Related
I wish to create breadcrumbs that employ css arrows, and want to apply a gradient on the background, but have been unable to set a gradient for the css triangles themselves.
I'm wondering if I can set an opacity on the triangles , and then lay them over top of a div with the desired background gradient. This also has to be compatible down to IE7. So far no luck. Does anyone have any suggestions?
Use PNG image for the arrow. Arrow image must have transparent background.
The best way to achieve what your looking for would be to use an image. IE7 I don't think supports opacity without some javascript manipulation. Use a gif or another type of image with transparent background.
This is how you set opacity or <=IE8
.triangle {
filter: Alpha(Opacity=80); // ie argh!
opacity: 0.8; // standard browsers
}
I want to use a linear gradient background color for a website. For example the gradient color starts from header and ends to the footer. Now the problem is that, since different pages have different amount of content, so the height of the pages varies. So in that case how can I set ending point of the color? For example I want the gradient from #b68d4c to #f6e7cf.
Using an image:
You'll need to figure out the shortest height of content that you want to cover. Then, in your image editor, create your gradient. Since it's linear, you can create it something like 10px wide by 500px tall (if 500px is the shortest height) and repeat it along the x-axis. Once your image is created, you would then write in your CSS:
body {
background:#f6e7cf url(path/to/gradient.jpg) top left repeat-x;
}
Note: the #f6e7cf should be the finishing color of the gradient. What this does is if the page is taller than 500px, it will show the same color as the bottom of the gradient, giving it the illusion that it is continuing.
Using CSS3
As Ryan Casas pointed out, using the Colorzilla Gradient Editor is the most simple way to I've found (although, you don't learn as well because you aren't hand coding, but that's a different discussion). Essentially, you would put your two colors at 0% and 100%, ensure that it's going vertical, and copy the code into the body { } selector.
Use % on the gradients. Here you have a generator: http://www.colorzilla.com/gradient-editor/
Right now I have this CSS for a button:
background: #19558D url(../images/gradient.gif) repeat-x top left;
The gradient appears, but the background color doesn't. When I reload the page, the color appears for a split second, but then disappears to the gradient. How can I get both of them to work?
Ok, so you have several options:
1. Use Only Images:
You can do the job by editing the gradient so that it looks exactly how you like it to be, without any new CSS. (This would be the one you used to solve the problem).
2. Use Image on the top and the rest in solid color:
element{ background:#000 (url) top left repeat-x; }
This will place the image in url at the top, and make the rest of the element of a certain solid color. Be aware that if the image covers all of the element and isn't transparent, then the solid color will not be visible.
3. Make the gradient transparent/alpha:
If the gradient covers all of the element, you can make it transparent, or semi transparent, so that the CSS background-color is visible behind it. For example, if you make a gradient that goes from black to transparent, and then add a white CSS bg, then you will get a black to white gradient. Be aware that the only images that will work with this method are .png ones because they are the only ones that support alpha levels (partial transparencies).
is the GIF transparent? I use PNG format as PNG-24 allows alphablending masks, where as GIF only supports transparent or not (1/0)
But I think you need to post a link to it or a image of what it looks like, including the GIF.
We need some pixels specs, such as width and height to fully understand the problem.
In css you may normally set both a background-image, and a background-color, and the image will be rendered on top of the color.
#someDiv
{
background-image: url(arrow.png);
background-color: blue;
}
This will cause #someDiv to have a blue background with the arrow.png image above.
However, what if I want to use firefox's -moz-linear-gradient to do a gradient for the background, then is there a way to make the image render over this gradient?
EDIT:
The MDC states that gradients replace the background-image tag. So in that case, I guess a follow up question is is it possible to specify two background images and have them render one on top of another?
This example on the Mozilla site has background gradients under background images:
https://developer.mozilla.org/en/css/multiple_backgrounds
I'm specifying a color hex code as the background-color of a really long div. However, i'd like this color to be only repeated horizontally, from left to right, in the first part of the and not go down any further.
Can that be done using background-repeat:repeat-y or is there another method?
Colors have no height...they just exist, without dimensions. If you want a visual distinction between your background color and the rest of the document, you'll need to use a solid image as your background-image:
div.className {
background-image:url("images/background.jpg");
background-position:left top;
background-repeat:repeat-x; // Causes repeat from left-to-right only
}
Do you mean repeating background color or an image? I assume an image becaues repeating a background color makes no sense. And yes this is the correct way:
#mydiv {
background-image: url(images/background.png);
background-repeat: repeat-x;
}
The background-repeat CSS property defines how background images are repeated. A background image can be repeated along the horizontal axis, the vertical axis, both, or not repeated at all. When the repetition of the image tiles doesn't let them exactly cover the background, the way adjustments are done can be controlled by the author: by default, the last image is clipped, but the different tiles can instead be re-sized, or space can be inserted between the tiles.
http://www.handycss.com/how/how-to-repeat-a-background-image-horizontally-with-css/
You can achieve this without a file when creating an 1px image and put it into your CSS encoded as base64, or by using multiple html elements and positioning. You can not specify a background size for a plain color defined in pure CSS (without using the image trick) at this time.
Also see Is embedding background image data into CSS as Base64 good or bad practice?