Converting line drawing - black line to white line?

[judge]

Hello all-

Wondering if any of you can tell me how to make a blackline drawing (scanned in @ 800 dpi grayscale) into a white line (w/ transparent BG)?

Basically I'm putting a line drawing over a photo in Photoshop & want the lines to be white. I bet this is simple---but I don't know how to do it.

Any ideas?

Thanks

[DCM]

Select the background of the line drawing with the magic tool. Erase all the white background. Then invert the layer with the black line..... should work.

[judge]

Select the background of the line drawing with the magic tool. Erase all the white background. Then invert the layer with the black line..... should work.

Yeah- I've done that. It seems to lose the crispness of original drawing. I think there's another way that preserves the exact detail of original drawing.
But I don't know how it works.

Thanks for responding, though.

[sugarskull]

convert to grayscale, bump up the levels (cmd+l), color select, pick black, once it's selected duplicate selection (cmd+j), get rid of the background now, or turn it off.

[Switch]

What ^^ said thereabouts.

[DenisMutter]

yeah - that oughta do it.

[HomeBrewed]

There are a few good actions and plugins that remove white backgrounds from artwork and line drawings. Here's an article about one that I've used and where to dl (for pc only):

Wisnaes.com - Visual communication » How to remove a white background with the Remove White plugin

There's a couple other good ones out there, too, but I've got them at work.

[necro]

invert

[IVARTON]

Go to channels > comand/cntrl click the channel > go back to laters > New Later > invert selection > select white as your color > Fill

[macthulhu]

You guys are over thinking it.

Paste the drawing into it's own layer---> Invert ----> Change layer mode to "Screen"