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04/25/2004 03:08:06 PM · #1 |
| Would like to ask all the experts out there....I would like to have one of my images developed into poster size (i think that A1 size...someone pls enlighten me)....do i need to make certain adjustment to my dimension size to make sure that my image's quality would not be compromised? |
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04/26/2004 12:49:33 AM · #2 |
Well, it mainly depends on the resolution your camera is capable to capture. The more higher it is the bigger you can print. beside, to have a good quality you should check the PPI (Points Per Inch) of the printing device. a critical point is that most of the cameras capture images with 72 PPI which is relatively low and is only useful for WEB publishing. what you do is to open your picture in a Photo editing tool such as Photoshop, go to the image>imagesize.. and change the PPI of the picture to the PPI supported by your printing device. you can notice that when you change the PPI and increase it to the desired setting the picture size decrease.for instance if you have a 2560 X 1920 Pixel image it will be printed as 21.67 X 16.26 cm when setting the PPI to 300. now to your problem, you want to print on a 84.1 X 59.40 cm paper (A1). there are a couple of chances: 1- upgrade to a higher resolution camera (12Mp) or in the photoshop go to the image>imagesize.. and then in the document size enter the width and height you intend to print. just keep this in mind that oversizing a picture will force the application to generate pixels according to the image size and this will show itself in the final print, so you can not expect a perfect result doing so.
Hope this might help a bit.
cheers |
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04/26/2004 12:56:42 AM · #3 |
| Pixels-per-inch as captured is irrelevant. Total number of pixels captured is relevant; then, as described, divid your total pixels by the final dimension to get ppi at print size -- if that number's over 150, you're probably OK. If not, you'll have to upgrade to a larger camera or upsample the image. |
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04/26/2004 01:22:44 AM · #4 |
Originally posted by GeneralE:
Pixels-per-inch as captured is irrelevant. Total number of pixels captured is relevant; then, as described, divid your total pixels by the final dimension to get ppi at print size -- if that number's over 150, you're probably OK. If not, you'll have to upgrade to a larger camera or upsample the image. |
Will you kindly give an example, suppose i have a 2560X1920 Picture and want to print it 13X18 cm what will be the calculated PPI.
Thx. |
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04/26/2004 02:36:59 AM · #5 |
Originally posted by soheil:
Originally posted by GeneralE:
Pixels-per-inch as captured is irrelevant. Total number of pixels captured is relevant; then, as described, divid your total pixels by the final dimension to get ppi at print size -- if that number's over 150, you're probably OK. If not, you'll have to upgrade to a larger camera or upsample the image. |
Will you kindly give an example, suppose i have a 2560X1920 Picture and want to print it 13X18 cm what will be the calculated PPI.
Thx. |
13 x 18 cm is about the same as 5 x 7 inches. Your image doesn't quite match that aspect ratio, so you'll have to crop something or reduce the image and have a border.
2560/7 = about 365 ppi
1960/5 = 384 ppi
So, without cropping, you have enough image data to go a little larger at excellent quality (300 ppi) and more than twice as large (say an 11x14) at acceptable quality (150 ppi). |
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04/26/2004 04:30:47 AM · #6 |
I heard a tip to use when enlarging like this is photoshop. Not tested so i can't say if its good or not.
Apparently if you increase the size of the pic to 110% and then do the same again and again until you reach the correct size, photoshop works it enlarging magic more effectively.
Anyway, let me know if anyone tries this sucessfully. |
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04/26/2004 04:33:11 AM · #7 |
If you use the new CS of Photoshop version you can supposedly bypass this step. There've been several recent posts about it in other threads.
I've also heard of other values, like 105%, when performing a stepped upsample like that. |
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04/27/2004 07:43:39 AM · #8 |
| have anyone tried blowing up their photo to A1 with a rebel cam?? coz when i tried enlarging my image to A1 with 180ppi....still look pretty sharp to me....but just wanna confirm if anyone has done it b4? |
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