Calculators

Calculators for planning: image storage, transmission, print and repro

I often need to make advanced plans around quantities, sizes and transmission of images for my clients and to aid this I use some simple maths to quantify things. To aid this further I have created a set of web calculators covering all the common tasks.

Here are some common calculations I need to make when planning in advance:

  • How long will it take me to upload 2GB of images via ftp to a client? – or download 1TB?
  • How many raw or tiff files can I store on a 3TB drive or a 9TB NAS?
  • How many minutes (or hours) will it take to transfer 1620GB of raw files to a NAS from a client’s USB2 external drive?
  • To make a high quality 20″x16″ print at the Epson ideal print density of 360dpi how many pixels do I need?
  • What is the lowest megapixels a camera or file can be to still cover (for example) an A2 print at 350dpi? how about 7″x6″  at 150dpi?

All of these can be answered using the calculators below, here is a list of what they do:

 

Time and transmission:
Internet calculator – Calculate upload and download times for large files and collections of images.
Network calculator – Calculate transfer times for large collections of files across a local wired or wireless network

Capacity and file size:
How many images? – Calculate how many images/ files can fit on a hard disk, NAS or optical device
Camera file size and space calculator – Calculate files sizes and storage requirements of a particular camera
Card Full? – Calculate image capacities for your camera writing to different sized SD or CF cards

Dimensions for print and repro:
Print size calculator 1 – Calculate file size requirements when someone asks for a physical size for print or repro, this calculator allows you to specify units of meters, feet, inches, cm, mm.
Print size calculator 2 – Calculate native print and repro sizes from your images pixel dimensions.

Misc:
View: Print Size screen dpi calculator for photoshop -New method for when you know your screen size and the resolution its using

Getting View: Print Size to work properly in Photoshop – Older method for when you have a ruler but dont know all the figures needed for the new calculator

I hope you will book mark these individual calculators to help plan your workflow. If you have any ideas for other calculators let me know and I will see what I can do.

Photoshop: View Print Size dpi calculator

Monitor DPI/PPI Calculator

Change the following values to represent your setup
PPI px/cm
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Stephen Johnson / Copyrightimage.com

I like using View → Print Size in Photoshop because it lets me see an image at the exact size it will be printed. That makes it easy to judge how the final piece will look in the real world. For example, you can hold a picture frame up to your monitor to see how the print will sit inside it, or check whether the image quality will hold up under close inspection—especially useful if you’re producing something large, like a 10-metre print.

By default, Photoshop assumes a monitor resolution of 72 DPI. That was roughly correct for mid-1990s displays, but it’s not accurate for modern screens. If you know your screen’s physical size and the resolution it’s running at, you can calculate the correct DPI for your setup. Enter that value in Preferences → Units & Rulers to ensure Print Size displays your work at a true, real-world scale.

If you dont know any of the numbers to enter then try this alternative method instead: https://copyrightimage.com/2017/06/20/getting-photoshop-to-display-image-size-correctly/

How many images?

Getting View: Print Size to work properly in Photoshop – older method

 

I love using “Print Size” in the Photoshop “View” menu as it allows me to see how big the image will print in the physical (real) world.

Read more

Network calculator

Print size calculator 1

Print size calculator 2

Card Full