Small Size Low Res to Big pic High Res

gd0g427

Hey guys, im new to these forums and photoshop and have a question. Im in the Car wrapping buisness and by mistake i designed a wrap at 6"x4"(Roughly) at 72 dpi. When i send it to print off of course the massive enlargement of it(120"x48") leaves it extremely blurry. Now to try and fix this i opened up a new document with 120"x48" Dimensions at 300dpi and simply placed my 6x4 .psd wrap into my new document and fit it to the canvas; then rasterized it. To my surprise, it didn't even pixelate when i did this and shows up extremly clear. So my question is, did this actually make my picture 120"x48" at 300dpi, im confused LOL

thehermit · Posted: Sun Feb 05, 2012 4:08 am Post subject:

Welcome to the forum. I think you may have some reading up to do on resolution and dpi or more accurately ppi.

First thing to do is work out how many pixels are in your image, only this will allow you to assess what your print sizes will be. Try this calculator for determining it.

For further reading and to avoid confusion read this

Oh and to answer your question. No you didn't.

jerryb4417 · Posted: Sun Feb 05, 2012 12:23 pm Post subject:

hi,
these are my thoughts and opinions and I'll try to stating in a logical manner...

the short answere to your last questions is yes... however here some things to be maybe aware off...

1. first it all about the number of pixels ... the more pixals you start off with the better the quality will be..
example: a 640 by 480 picture (appx 1/2 meg) you have taken , when printed on a 2x3" will look good however print that 640x480 on a 8x11" paper will look bad and pixalated etc... it like you take a small image and zoom in close...
however taking the same picture at 1240x900 , appx 1 meg , and when printed on a 8x11 the picture looks much better ..

note: keep in mind that i am primarily at this point talking about bitmap images... however you also have vector type images , which in your workflow your using..... you may want to add to your reading the differences and the pro and con when using the two..

2. in your workflow your starting out with a vector layer .. at a giving canvase size.... when go to rasterthat not based on pixals it based on math, so that when you rastererize , converting vector data to pixal data .. the software will create all the pixals that required, it will retain the quality as much as possible... and hense in your case it works out much better... in the end it all about the pixals how many you have...

3. as far as the ppi ,, basically how close the pixils are... the higher the number , along with the number of pixals) the more more, the closer the pixals are and the more of them, the more details you can see and when printed the sharper and detailed the print will be...

but again keep in mind there a difference between ppi and dpi.... smiling... and we don't think about the difference.... ppi is for viewing dpi is when printing...
rule of thumb is that for high quality ,printers like hp or canon high set ppi for 300 and for printers like epson it 360 ... the reason is that the alogrythms (that convert ppi to dpi) work best if the ppi numbers are close to the printer dpi.. did i confuse you... smiling....

I hope this partially helps... the subje of pixels , ppi,dpi, is quite lengthy and i have a long way to go myself in understanding...

anote: a lot of designers will actually go back and forth between a vector program like illustrator and ps .. they do most of thiere vector work in illustrator (because it can do things that ps can do or not do good enough) and then import in ps shop ... and it goes back and forth ...

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