How do i increase an image size for poster printing

TG.

TG.

Suspended / Banned
Messages
6,905
Name
Tel
Edit My Images
No
Sorry chaps i know i've seen how to do this before, but can't find it on here now, i want to increase the size of a file for printing to A1 size, i know you have to somehow increase or interpolate the pixels in photoshop, so could someone please explain how it's done, or point me in the right direction to a tutorial on the net, for the record i'm using CS3, many thanks in advance.

Tel :thumbs:
 
Can't you just go to image size, and increase it to what you want?
 
The Genuine Fractals website mentions the use of Photoshop's Bicubic Smoother (as not being as good as their solution).

An alternative to Genuine Fractals is Imagener.
 
stokecity_m said:
Can't you just go to image size, and increase it to what you want?
Click to expand...

Well i guess that is the logical answer and what i originally thought :D but i just thought there was more to it than that, thanks for the reply though.

jack-thompson said:
just go to image size
and for a1 the size is 59.46 x 84.09 cm
Click to expand...

Thanks mate, again as above it seems the obvious thing to do, but i thought there were other things like interpolation, i'm obviously on the wrong track though and it is just that straight forward :bonk: thanks for the reply.
 
TG. said:
i thought there were other things like interpolation, i'm obviously on the wrong track though and it is just that straight forward :bonk:
Click to expand...

Depends how good a result you want. Genuine Fractals and Imagener do the interpolation. Genuine Fractals is a plugin; Imagener is a standalone program.
 
Any chance of seeing what it is you are printing at that size?
 
I'll keep checking on this thread with interest.

I have an exhibition to enter and wanted to get a few images printed out at A0 (841mm x 1189mm) but was wondering just how much interpolation you can get away with if you retain 300dpi, or whether it's best to resize via the DPi, say down to 150dpi.
 
To print at poster size you really need to up-rezz the image, that is, add more pixels. There are several products for doing it, although they tend to be expensive because they're used mainly by pro print shops. I've listed 4 on PhotoSoftwareNews.com -- navigate from the Blow Up page on Image Rescalers.

http://www.photosoftwarenews.com/Image_Rescalers/Blow_Up.html
 
What is your starting image size in pixels? Remember you don't need to print the new image at 300ppi. An A1 print will still look fabulour at 150ppi and the file size will obviously be drastically reduced.

I find photoshop will do the job well enough and it really is as simple as changing the image size. I generally use the Crop tool to do this *just enter the numbers below into the crop tool's option bar and good to go. If you need to, you may want to do some sharpening after you resize.

The A1 size is 23.4 × 33.1 inches - So to print at 150ppi you need an image that is 3510 x 4965 pixels.

Yes there's other software packages that do a better job but if you don't have Genuine Fractals Ps is not far behind in terms of quailty.

Alternatively send your image to a good lab and they will resize for you and will probably do a better job.
 
i have used both CS4 and genuine fractals 6 for enlarging and to be honest the output is pretty similar. Genuine Fractals is better but not that much better...
 
arjxh56 said:
i have used both CS4 and genuine fractals 6 for enlarging and to be honest the output is pretty similar. Genuine Fractals is better but not that much better...
Click to expand...

+1
 
I have just enlarged a print to 1500mmx600mm its good but not great...it looks better the further away you are.So it depends if its for home use or whatever.

I have Genuine fractals 6 and in the end didnt use it because it cartoonised the image too much.....any stretching or using software algorythms to create pixels that were not originally there is going to effect the image.

In the end I just used CS3......Sending the print order straight.In the three samples I printed,Genuine fractals,CS3 Bi-cubic smoothing and CS3 straight.

The Cs3 stright give the same result as the Bicubic and both were better the GF.
 
I've tried upscaling the same image to the same size with CS2's Bicubic smoother, Lightroom and Genuine Fractals 5, the quality from Genuine Fractals was much better than Lightroom which was a bit better than CS2.
 
Just remember that such a large print is unlikely to be viewed from a few inches away.
 
You must log in or register to reply here.
Back
Top