The Importance of column width for televiewer images.

 

To thin	Correct	Too wide

The depth related image feature in OpenGround allows you to position a continuous graphic down the length of a log using a Range Image. This feature is ideal for Downhole or televiewer images however it is important that the aspect ratio of the image is maintained so that boundary angles are not distorted.

To do this you need to work out the following

• Aspect Ratio for 1 meter of the image
• Distance on log of 1 meter of logging

The aspect ratio of the image

The aspect ratio of the image can be worked out using the following equation

(Total Pixels/number of metres covered by the image)/Image Width in pixels

Example = A  televiewer image is 9200 pixels long by 360 pixels wide and covers 20 metres.

Image aspect ratio = (9200/20)/360 = 1.277

Column Width

Column width = (Plot area for log / Units per sheet) / image aspect Ratio

Example

Plot area for log = 200 mm for a 10m log. 

(200 / 10) / 1.277 = 15.66mm column width

Therefore a 16mm column width should be used and the image set to be centred in the column.  Do not set the image to fill the column width