How to increase a pictures dpi

[oceanic]

If you have a simple picture like say a macdonalds logo or street fighter logo, is there any way to increase the dpi of the picture? Both of these pictures are very simply logos. But if i try to zoom in and save them, the edges tend to become pixelated, even though they are very simple images.

I know that principally no new information can be created from a picture that does not have it. But i'm sure there must be a way to increase the dpi of a picture and maintain the curves etc without making it a jumble of squares?

Complete newbie if you haven't figured it out by now.

if you know how it might be done, multiple solutions are always welcome, please give a simple noob proof guide .

thanks

 

[JLBerry]

You start clever by saying

I know that principally no new information can be created from a picture that does not have it

...but then you continue with:

But i'm sure there must be a way to increase the dpi of a picture and maintain the curves etc without making it a jumble of squares

Now I understand why they call such conflicting statements an oxymoron...

 

[oceanic]

The thing with smug people is that their arrogance blinds them to admitting their flaws, which means they always carry around with them a lot of crap. Crap that they always want to fling onto other people and make themselves look good by doing so.

I really am not interested in seeing your highness showing off your huge collection of ugly crap qualities in your character. So if you aren't going to be polite, don't bother commenting.



But for your information i was talking about something like this. I just recently found it on another sight.

Then, if I wanna print both pictures on an A3 format (I'd need a 300 DPI picture at least) I should expect a slightly different quality between the 2 prints. Is that correct?

Yes. That's correct. There's one other concept you'll need to master called "Interpolation". Think of interpolation the same as using an enlarger in a darkroom. When you check that "Resample Image" box and then key in a higher resolution, Photoshop will enlarge your image. What's Photoshop doing? It's using a mathematical formula to create pixels that weren't there before and your image will grow in size.

Now, if you do NOT check that Resample Image box Photoshop will not resize the image for you and will not add pixels that didn't exist before.

Why would you want to add pixels that aren't there? Well let's say you want to print a really large print - say 13X19. You have two choices: Print it at a low resolution, say 180 dpi. To do this you would NOT check that "Resample Image" box and Photoshop will NOT add pixels.

But you may find that the quality of the print isn't very good when printed at 180 dpi. So your other option is to use interpolation or enlarge the print by having Photoshop add pixels.

This is usually a two-step process: First, UN-check the Resample Image box. Next, enter say 300 dpi in the resolution box. Now, CHECK that box and tell Photoshop to increase the image by say 110 percent. The 300 dpi will stay the same but your image will grown in size when you press enter. This is confusing, I know. The best thing to do is fool around with the Image>Resize Image dialog box 'til you get the hang of it. Good luck!

If someone could explain how to do this would be appreciated.

 

[Mike Read]

If you have a simple picture like say a macdonalds logo or street fighter logo, is there any way to increase the dpi of the picture? Both of these pictures are very simply logos. But if i try to zoom in and save them, the edges tend to become pixelated, even though they are very simple images.

I know that principally no new information can be created from a picture that does not have it. But i'm sure there must be a way to increase the dpi of a picture and maintain the curves etc without making it a jumble of squares?

Complete newbie if you haven't figured it out by now.

if you know how it might be done, multiple solutions are always welcome, please give a simple noob proof guide .

thanks

You could try enlarging it, and then using one of the blur filters. it won't look anywhere near perfect but it's better than pixelated