How do i convert a picture to greyscale in adobe photoshop CS3?

I just got this program today. I'm trying to get my photo all black and white except for roses. ThanksHow do i convert a picture to greyscale in adobe photoshop CS3?
Ah! So you want the answer to one of the most frequently asked Photoshop questions, how to make the image black and white (or rather grayscale) with just one part color. Here is my tutorial (I've answered this so many times, I've kept a text file just for this purpose.) There are other methods (Photoshop almost always has more than one way to do something), but this is a ';non-destructive'; method.





How to make image black and white with just one part color:


First, with your file open, go to File%26gt; Save As, rename the file, select Photoshop for the file type, and select where you want to save it to. Then hit Save. You always want to work on a copy of your image, leaving the original image alone.





With your Layers palette open (always keep that open, it's just too useful!) grab the layer and drag it to the bottom of the palette onto the icon that looks like a square page with a corner turned. This is the New layer button, what you are doing is creating a new layer from your original layer. (note, if your original layer has a little lock icon by it and its name is Background, double click on it and it will give you a little dialog box that will have a new name of Layer 0. You can rename it or accept that name, just click ok. Now you can edit that layer if you need to.)





Click on the top layer (the new one you created) to make sure it is selected. Go to Image%26gt;Adjustments%26gt;Desaturate (this is one way to make something that was color into black and white, actually shades of gray. In Photoshop there are many ways to do something, so experiment!). This layer should now be black and white. To see that the bottom layer is still color, click the little eye icon next to the layer thumbnail in the Layers Palette for the top layer. This hides the layer and will show the layer underneath. Now click the square with the eye icon to turn it back on.





With the top layer (the black and white one) highlighted (selected), click on the icon on the bottom of the Layers Palette that looks like a circle in a square. That's the Layer Mask icon. You have just applied a Layer Mask to the top layer. You will see a little box with an outline around it appear to the right of the Layer thumbnail. It should be white, but if it's black, that's okay, you'll just do the opposite of what I am about to tell you.





Okay, make sure that little box is selected (click on it.) It's important that the Layer mask is selected because you are going to paint on the mask. Click on the brush tool. Down at the bottom of the Tools palette, make sure the two squares show black on top and white for the square in back. If not, there's tiny squares underneath, click on those to reset the foreground and background colors to black and white. If you have white on top, click on the curved arrow above the squares or hit X on your keyboard to switch them.





With black selected for your brush color, and making sure the Layer MASK thumbnail is selected, check that the opacity (it's up in the options bar at the top of your image) is set for 100%. Now start painting over the part you want in color in your picture. You will see color showing through. If you paint more than you want, hit X to switch the brush to white and paint the mask back in. Also if your brush is too big you can make it smaller hitting the open bracket key: [. If you want to make the brush bigger, hit the close bracket: ].





When you are happy with the results, go to File%26gt;Save As and rename. (Or just Save.) If you want to be able to upload this image, you need to go to Layer%26gt;Flatten and then save as a .jpg.





Have fun. Experiment. Read some how-to books and you will get more ideas.