[SteveJobs]

Hello,
I want to change a photo from black and white to purely white. Later on, it will be printed on a folia which is to be put on a black background which will give the contrast to understand the picture. However, first I need to discard all information except for white. How? I don't want any grayscales, only white. Is this possible in photoshop?

I hope so, it's very important for a project of mine,
Greetings,
Steve

P.S. I mean "foil" instead of "folia". I picked the wrong word, apparently (edited afterwards)

[Sherman Homan]

Not sure I understand, white is the absence of color. As was famously said: there is no there there. If every pixel is turned to white you have erased the picture. In Photoshop, reset your color picker so that the foreground color is white, select all, fill with the the foreground color. But there will be no information left...

[SteveJobs]

Originally Posted by Sherman Homan 

Not sure I understand, white is the absence of color. As was famously said: there is no there there. If every pixel is turned to white you have erased the picture. In Photoshop, reset your color picker so that the foreground color is white, select all, fill with the the foreground color. But there will be no information left...

Hmm, I haven't put it clearly enough, apparently.

If you take a brush and paint white lines on a foil (just checked it and folia doesn't seem to be the right word, sorry) and you put that foil on a black tabletop, the white lines are white lines and more than nothing. Then, they are there. Of course, on a white background, they are invisible (which is part of the idea I want to convey).

I hope someone can help me,
Greetings,
Steve

[JonoMarshall]

it will be printed on a folia which is to be put on a black background

So are you printing in white on a black portfolio?!

You can use photoshop to create a white area/image on a transparent background and then send the .psd file itself or a transparent .gif, etc off for printing?

Or you could just work in any two contrasting colours (white on black if this is to be the end result anyway) and then let the printers know which bit is to be ignored, etc?

I'm not sure I fully understand what you're trying to achieve, if you could elaborate then people might be able to help further.

[JonoMarshall]

Sorry you just posted..! So you want to print on something that's transparent? (akin to over-head projector films, etc?)

[andi*pandi]

posterize your photo to get a pure black image. Tell your printer to use white ink wherever black shows up. All plates are black to a printer.

[chabig]

Starting with your black and white image, select Image > Adjustments > Invert. That way, only areas that were white in the original image will be printed.

[SteveJobs]

Hi,
thanks for the many replies.

Unfortunately, my question is still not answered. I don't want any grayscales and that's my problem. I do have several pictures I want to process in some way so that they print only in white on a transparent foil (which is later to be put on a black background so you can see everything clearly). So, the only color I want to have in my file is white, no gray. I know how to invert a picture, but is there some filter that removes all gray?

Would be absolutely neat,
Steve

[andi*pandi]

posterize. or adjust the levels, or curves.

[SteveJobs]

Hey!

It now works as desired! Great, great, great!

Now, one more thing: How do I actually print in white? Is this possible with normal printers or do I have to run out to print professionally?

Greetings,
Steve

[andi*pandi]

I have never seen a desktop printer that came with white ink, although that might be possible. If you are making many copies an offset printer can use white ink. They will ask you to prepare your file with everything in black though (or they will charge you to fix it.) Save your file as the "intended" result and give them black artwork so they can make a plate. This will be expensive unless you are making 500+.

You could also look into screen printing or more "craft" printmaking.

[KeriVit]

Just listen to Andi... carefully.