Just browsing the posts, and thought I'd throw an FYI out there since those of you requesting probably have never used photoshop.
If you're looking for chops a few things would go a long way in making it easier for those of us who have the program to give you fast and realistic results...
1) The highest res image you can find. If you don't know how high the resolution is, go with this addage: BIGGER IS BETTER. The finer the detail, the more we can blow up the image to get the shading/coloring/cut and paste exactly where it needs to be so it doesn't "look photoshopped" ie like sh!t. You can always shrink an image to get it to fit. But you can only blow it up so big before it looks like its made of legos
2) If you could kindly pick out the pictures for us, we wouldn't have to spend time looking for the proper images...it's annoying and time consuming. That being said. if you want anything ADDED or REMOVED from your car you need to find images with HIGH CONTRAST backgrounds of (preferably) one color. For instance, your black car against a white background. This makes it much easier to cut the shape out (also annoying and time consuming.) SPECIFICALLY FOR WHEELS! Don't find an image of a gunmetal wheel on a gray or black background, trying to select the wheel and separate it from a low contrast background is one of the 9 rings of hell...i am more than happy to shop some sexy brembos and big rotors into your wheels and only color in the actual wheel instead of just giving you a crappy looking black wheel mounted on thin air (not that anyone in this thread does that
) but it takes time, and the less I have to do to get it to look right the happier we'll both be.
3. Perspective: If you want a set of wheels and you drop an image of them that is seen full on from the side, drop a shot of your/a car of the same color that's from a full side perspective. Yes, images can be warped and distorted to change the perspective, but this is often destructive to the image, so get as close as possible. If you have a front wheel turned out and the back is oblique like a down the line shot from the rear, then find two images of the same wheel from those two perspectives...and it's usually much easier to pull from an installed set up than a stock ad image. Another great example: black roofs. If all you can see of your roof in the image is a tiny sliver, all that I can change is a tiny sliver. Take a high angle shot of your car if you want a black roof, and make it a HI RES image...it's aggravating trying to push pixels of color around when the roof is only 3 pixels wide because of the shot...
4. Thank your photoshopper for his or her effort, and if you really like the job, compliment him or her. We all like to know that our work is appreciated!
EDIT: Be aware that color changing can be difficult and time consuming. There are several ways of accomplishing it, but the easiest one doesn't work too well for the last several versions of the program. This is especially so for coloring things in black or white. Black is the absence of color. To change a blue car to red is far easier than changing a red car to black and having it look like a car and not a silouhette. Off the top of my head, I believe it would be IMPOSSIBLE to change a black car to anything but black because it contains no color...though I've never tried. White is the easiest, but will have little detail (white highlights on a white car are white). Please remember this when asking for color changes, and even so, without extensive knowledge and probably a lot of (expensive) plug ins, I can't get a candy red car to look like a nord grey because of the flake and the way light deflects/refracts/reflects. Same thing goes for changing materials like carbon fiber skirts and the like. Extremely difficult to match these light patterns between materials. Glossy and matte is one thing, fundamental structural differences are another. Probably TMI. But that's the story of my life.