hey all..gotta question.... I made a design in photoshop thats 600 x 600 pixels. Usually I make them with 150 dpi, but this time I accidentally did it with 72 dpi...If I were to sent them to a place to make stickers out of them that were 4 x 5 in color, will they stay the same quality or am I gonna have to do this thing over again at a higher dpi....damnit, I should've done this in illustrator anyway....thanks...

If you want to increase the resolution and still maintain image quality, you really have only one choice and that is to lower the physical dimensions of your image. Since you are starting @ 600x600 (this is the same as 4in x 4in) and want a 4in x 5in ouput you are going to lose some thing. What (if i may ask) is the artwork like. You mentioned you should have done it in illus. Is it primarily lineart? If so it may not be to bad... (if you used the vector tools) What's the output device?

In Irfanview you can make the resolution higher through a B-spline technique. Also in the program S-spline (but Irfanview is freeware)

yeah i used the vector tools...its mainly just 4 solid colors and nothing else.....i thought that 600x600 would actually be 8in x 8in, or am i wrong...

at 150dpi 600x600 = 4in x 4in at 72dpi 600x600 = 8.33in x 8.33in or roughly twice the size / half the resolution RetroCity

Like Gunsan mentioned Irfanview is a really good "freeware" app that maybe able to res-up your file without to much loss... you can find it pretty easily i think its www.irfanview.com either way it's a good app to have in your arsenal, s

Can you post it, so we can see exaclty what you did? This will eliminate the guess work.

The Genuine Fractal plug-in for Photoshop can do this better thatn anything-but it's expensive and for the Mac only I believe. Printer ready is generally 300dpi, lo rez 144dpi and web use 72dpi, but you can resample the image in Photoshop and still do OK. If your stickers (MacTac) are printing with a docucolor printer you are not going to lose much image quality between 150 and 72dpi. Just don't compress the 72dpi file (some artifacting comes from compression and re-saving) your files.

Genuine Fractals is for PC too.

yeah, i spoke to the printing people and they said that the image might become dull when printing....i'm gonna go and make a sticker anyway, just to see how it'll come out, if anything i'll just redo it illustrator cuz i'm gonna have to blow it up postersize sooner or later anway....thanks for the help people....really appreciated.....

Just regarding Genuine fractals and upsizing: It's actually better, or rather intended for resampling larger images, like photo size to poster size, or photo size to billboard size (really!). On something the size of 4x4 or 6x6, you probably wouldn't be able to tell the difference between photoshops bicubic resample and genuine fractals. just my 2 scents. BTW, for a good (free) resampling action, there is one available on http://www.fredmiranda.com , just click on the actions link (note, he does charge for some of them, but a good lot of useful actions can be had for free here also). take care