[Targon]

Curious, is there a standard way of working out physical dimensions of an un-scaled print of an image on a computer if the Image DPI and frame size is known?

eg 300DPI / 1428 x 1222 ?? How big would this turn out if printed and not scaled, what are the determining factors? I have a few images on my computer i want printed to be poster size to put on the wall...ill take image to pro print house.

Also i have a few simple black on white logos as jpegs tiny size on computer DPI 72DPI 762 x 837 how would i convert these to vector images so they can be blown up to be printed without bitmap quantizing (i don't know the terminology you use in graphics land-staircasing?) Is this possible to do ?

Thanks

[Westbo]

Originally Posted by Targon 

Curious, is there a standard way of working out physical dimensions of an un-scaled print of an image on a computer if the Image DPI and frame size is known?

eg 300DPI / 1428 x 1222 ?? How big would this turn out if printed and not scaled, what are the determining factors? I have a few images on my computer i want printed to be poster size to put on the wall...ill take image to pro print house.

To determine size: open the image in an image editor eg Photoshop. Go to Image>Image Size.

Also i have a few simple black on white logos as jpegs tiny size on computer DPI 72DPI 762 x 837 how would i convert these to vector images so they can be blown up to be printed without bitmap quantizing (i don't know the terminology you use in graphics land-staircasing?) Is this possible to do ?

No, unfortunately any "staircasing" effect would be increased as the image is enlarged.

Depending on the size and complexity of the graphic, it may be fairly simple to recreate them. However, it would require software such as Illustrator. "Place" each (JPEG) image in Illustrator, and then on a separate layer, retrace and fill the black (and white) areas accordingly. When completed, deleted the "placed" image and save as EPS. Otherwise, your best bet is to secure original EPS (vector) versions.

W2

[red rocket]

Originally Posted by Targon

Also i have a few simple black on white logos as jpegs tiny size on computer DPI 72DPI 762 x 837 how would i convert these to vector images so they can be blown up to be printed without bitmap quantizing (i don't know the terminology you use in graphics land-staircasing?) Is this possible to do ?

If you're on a PowerPC machine, you could give Delineate a try. (If not, they also have Winblows and Linux versions.)

[glypht]

DPI = Dots Per Inch (technically PPI, pixels per inch)

1428 / 300 = 4.76 inches

[th3ph17]

keep in mind that with a poster or a billboard you can get by with a lower resolution. The bigger the image [generally] the further away from it you are when you view it. You can print an image that size as a poster and it will look ok, just won't be really sharp.

[Thorzdad]

Remember, if you use something like Delineate to trace the image, you will still have to go in and fix the vectors. The outlining will not be exact. Never is. This is especially true if you are outlining a small, 72ppi image from the web.

[Westbo]

Originally Posted by red rocket 

If you're on a PowerPC machine, you could give Delineate a try. (If not, they also have Winblows and Linux versions.)

Kind reminds me of Adobe Streamline

[Railroader]

Originally Posted by Targon 

Also i have a few simple black on white logos as jpegs tiny size on computer DPI 72DPI 762 x 837 how would i convert these to vector images so they can be blown up to be printed without bitmap quantizing (i don't know the terminology you use in graphics land-staircasing?) Is this possible to do ?

Thanks

I have heard good things about http://homokaasu.org/rasterbator/ but I have not used it myself.

[Thorzdad]

Raterbator only blows-up other raster (pixel) images. What you might be able to do is use Rasterbator to enlarge your jpegs to a size where you could then use Delineate to create a smoother, more accurate vector trace. I wouldn't count on the quality to be too good, though. That's just my gut feeling.

No chance you could contact whomever you got the jpegs from and ask them for eps files of the logos?