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Photo Competition: Printing and Web Images

WBA Photo Competition –
How to send us your pictures for the web and resolution guide for printing photos

These instructions relate to the photos we will be putting on our web site.  The resolution required for these photos is a lot lower than that required for the printing of the photos for the photo completion.  For printing good quality photos, you want to have a DPI of 300 or thereabouts.

 

To obtain a good resolution for printing, choose the best quality settings on your camera when taking your photos.

Image Size

 

Pixel size:            600 - 900 width for a horizontal image    

Resolution:         72 - 102 DPI

Format:                                JPEG

File size:               200 - 600 k

 

Email your file through to: feeble@xtra.co.nz  (Fiona Keene) with WBA Photo Competition in the subject line

Basic instructions

Just bring either your

·        

Camera (complete with the USB cord that goes from camera to pc) with you to the next meeting.

·        

Or a datastick / USB stick with your image on it to the meeting.

This way we will do all the resizing for you – how easy is that?!  Or just email a copy of your image – as it currently is to feeble@xtra.co.nz and again we will take care of everything for you!

Advanced Instructions

If you want to resize your image and are unsure of how to do it, below are some instructions, that I found, on how to resize your image that I found using Photoshop.

If you’ve never done it before, I urge you to play around with a copy of your picture (not the original!), and see what works and what doesn’t.

If there are any questions feel free to email me: feeble@xtra.co.nz or call my mobile is 027 442 7013 and I am happy to walk you through it!

Document Size and Pixel Dimensions

Image editing software, such as Photoshop, can adjust many variables in your image. Some are relative variables, and some absolute. The absolute size of the image is the “Pixel Dimension.”  This is the number of individual little dots of colour in the image. The Document Size (in inches or cm) and the resolution (in PPI or pixels per cm) are relative to the Pixel Dimension. The Document Size tells you how big your image can print at the given resolution.

For example, if you have an image with a 6” x 4” document size at 300 PPI resolution, you can print that image comfortably up to 6” x 4” at 150 LPI. The absolute size of the image would be  1800 x 1200 pixels, that is the document size multiplied by the resolution (6 x 300 = 1800; 4 x 300 = 1200).

You can also do the calculations in reverse. If you have an image of 1800 x 1200 pixels, and you know the magazine it’ll be published in prints at 133 LPI, then you know you’ll need a resolution of 2 x 133 or 266 PPI, then divide: 1800 / 266 = 6.77; 1200 / 266 = 4.51. So that same 1800 x 1200 pixel image could also be printed as a 133 LPI image at about 6.75” x 4.5”.

That also means that if you have a scan at 72 DPI which is, say, 900 x 600 pixels, you could send that file to the printer as long as it was going to be reproduced as a 3” x 2” image or smaller (900 pixels / 300 PPI = 3”; 600/300 = 2).

If you scale the image down, Photoshop will decrease the number of pixels in the image by resampling them (averaging the values of neighbouring pixels to make new pixels), if try to increase the number of pixels in your image Photoshop will interpolate new pixels (inventing new pixels based on surrounding ones) giving you a bigger, but fuzzier, image.

The way to control this is with the “Resample Image” option in Photoshop’s Image Size dialogue box. If “Resample Image” is on, and you change a document Size measurement (Width, Height or Resolution), it will adjust the number of pixels accordingly, either scaling down the image, or resampling it up (decreasing image quality). If “Resample Image” is turned off, you cannot change the Pixel dimension, and changing the Resolution will affect only the Document Size and vice-versa.

 

Here is a Photoshop video explaining the process. 

https://www.youtube.com/watch?v=2qS1xBMlMu8

 

You may be able to adjust these settings using your camera software or other programmes available on the web for free.

If there are any questions feel free to email me: feeble@xtra.co.nz or call my mobile is 027 442 7013 and I am happy to walk you through it!

Fiona