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Category Archives: Graphics Lab

Geological Mapping Technician – Introduction

Hello, I am the Geological Mapping Technician for the Geology Department at the University of Otago.

If you need any assistance with any topics that you consider could be related to technical aspects of geological mapping please come and see me or send me an email.

Topics include: geology software, general illustration software, GIS software, mapping hardware (UAV/drone, GNSS/GPS, cameras) and a whole lot more.

Stephen Read
Room 1n17
stephen.read@otago.ac.nz
www.otago.ac.nz/geology/staff/general/stephen-read.html

Focus stacking images

This article has been specifically written for using the macro-photography setup in the Graphics Lab in the geology department and Adobe Photoshop CS5. Concepts are applicable to other equipment and versions of Photoshop.

UPDATE:

I have made a new post with instructions using Zerene stacker to stack the images rather than photoshop because it is faster, easier and produces better results in all cases that I have seen. For example Zerene Stacker took 72s to stack 11 images and photoshop took 125s, the difference in stacking speed is even more pronounced when more images are used.

Continue reading

Macro-photography setup is now ready

The macro-photography setup comprises: a copy stand, a DSLR camera with a macro-lens and a computer for controlling the camera and capture.

DEMONSTRATION

I will be giving a demonstration of the setup tomorrow (Wed 8/2/2012) at 10:40 am in the graphics lab. If you wish to use the setup but cannot make this time then you will need to contact me to get the training at a later date.

What is it for?

Taking photos of samples, specimens etc. close up. The setup has a maximum field of slightly smaller than an A4 sheet of paper. The smallest field of view is the size of the sensor: 22.2*14.7mm. Because you can capture 4272 x 2848 (L) pixels on this 22.2*14.7mm sensor your pixel density is 4888 ppi. This is much more than the 300ppi needed for print, so digital zooming and cropping will get you a lot closer with good results (see sample images in poster below).

Guidelines for use of the macro-photography setup.

Guidelines for use of the macro-photography setup. This poster is beside the equipment.

Scanning instructions and Learn to scan

Scanning instructions

I have put a poster in the Graphics Lab above the scanners. This posters provides very basic instructions for common scanning tasks.

A set of instructions for simple scanning tasks

The poster with scanning instructions that I have put in the Graphics Lab

Learn to Scan

I have also prepared a quick scanning training exercise for people who want to use scanners. It is designed to be used with the scanning poster. I recommend that anyone who wants to use scanning equipment should go through this training exercise. Come see me to collect the training exercise.

Any feedback on the poster or training exercise is very welcome.

Graphics Lab upgrades

Recent upgrades and changes

A new computer (GIS-4) has been setup in this lab with GIS + Adobe creative suite 5 and some other software. I have also put a bunch of different scale bars to be used for image capture. Unfortunately an old computer has died: GIS-3.

In the pipeline

  1. A DSLR camera that will be permanently attached to the copy stand, a macro lens for that camera and a computer that will control capture.
  2. A DSLR camera that will be permanently attached to the SMZ-U Stereomicroscope (binoc), and a computer to control capture.
  3. The SMZ-U currently only has transmitted light, we will get a reflected light unit for this.
  4. Get Arcgis 9.3.1 running on one of the computers for compatibility with older scripts etc.

For more information go to the page on the geology wiki about the Graphics Lab.