Knockoutoptions let you specify which layers “punch through” to reveal content fromother layers. For example, you can use a text layer to knock outa color adjustment layer and reveal a portion of the image usingthe original colors.
As you plan your knockout effect, youneed to decide which layer will create the shape of the knockout,which layers will be punched through, and which layer will be revealed.If you want to reveal a layer other than the Background,you can place the layers you want to use in a group orclipping mask.
Re: white on black text knockout carolineb Aug 19, 2011 11:07 AM ( in response to Monika Gause ) Thanks Monika - I changed it in Illustrator and it worked fine once brought back into ID.
To reveal the background, position the layer that will create the knockout above the layers that will be punched through, and make sure the bottom layer in the image is a Background layer. (Choose Layer > New > Background From Layer to convert a regular layer into a Background layer.)
To reveal a layer above the background, place the layers you want to punch through in a group. The top layer in the group will punch through the grouped layers to the next layer below the group.
To reveal the base layer of a clipping mask, place the layers you want to use in a clipping mask. (See Revealing layers with clipping masks.) Make sure that the Blend Clipped Layers As Group option is selected for the base layer. (See Group blend effects.)
Note:
To view blending options for a text layer,choose Layer > Layer Style > Blending Options,or choose Blending Options from the Add A Layer Style buttonat the bottom of the Layers panel menu.
Select Shallow to knock out to the first possible stopping point, such as the first layer after the layer group or the base layer of the clipping mask.
Select Deep to knock out to the background. If there is no background, Deep knocks out to transparency.
Note:
If you are not using a layer group or clipping mask, either Shallow or Deep creates a knockout that reveals the background layer (or transparency, if the bottom layer is not a background layer).
Lower the fill opacity.
Using the choices in the Blend Mode menu, changethe blending mode to reveal the underlying pixels. Hyperterminal for windows 10 free.
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I would like to know if there is any way I can apply 100% transparency to text so that we can see the background picture of the page within the characters in the text.
i.e. imagine I’ve got a <div> with a white background, and a background image on <body>. I’d like to set the text inside the <div> so that the background image on <body> can be seen through the text, despite the white background on the <div>.
I could probably use an inverted font but I would prefer a better way to do it if there is one.

Does it have to be dynamic? The only way to do that is with an image with transparency (GIF or, better, PNG).
I'm not sure if this is what you want, but will explain it anyway.
Situation: you have a non plain background that you want to bee seen through your text.
Solution: no CSS is coming to the rescue for this. You'll have to use your trusty image editor to create a layer with text, and another layer that will be the negative of your text
This could allow you to have some interesting effects, but if you want it to be dynamic, you'll have to generate the images on the fly serverside.
This kind of trickery is currently impossible with pure CSS (might be possible with Javascript).
Seeing Paul's find on webkit got me thinking on how to fake that behavior in Firefox, Opera and IE. So far I've had good luck using the canvas element on Firefox, and I'm trying to find some behavior in filter:progid:DXImageTransform.Microsoft.
So far with canvas, this is what I did
by using a detination-out compositing and drawing text on the canvas.
I’m not exactly clear what you’re asking (100% transparency means that something’s invisible, and invisible text isn’t generally a great idea), but in general:
The CSS opacity property applies to an entire element, not just its text. So if you have this HTML:
And this CSS:
Then both its background and its text will have 50% opacity.
rgba colour values allow you to specify semi-transparent colours. So, if you have this HTML:
And this CSS:
Then only its text will have 50% opacity.
I think rgba colour values are supported by slightly fewer browses than opacity.
Ah — if you’re talking about “punch-through” transparency, no, CSS doesn’t do this.
Except for WebKit (the rendering engine in Safari and Chrome), which has a totally custom, made-up-by-Dave-Hyatt, not-even-in-CSS-3 property value, -webkit-background-clip: text;.
No other browser other than Safari and Chrome supports it.
You can spent the time to make your own font with InkScape and IcoMoon and make a negative knocked out font, then your letters can be see trough! I used this technique for some see trough Icons.
Why not try to set the DIV's background image to a completely transparent GIF?
Using a .png without background is a good method. In Photoshop you can save for the web.
or in css: