How to combine images of varying sizes from different sources into a measurable standard
WinJUPOS is the so ware equivalent of a Swiss army knife for planetary observing and imaging. It provides many functions, including the ability to measure, analyse and report on feature evolution and dri over time. One hurdle to overcome is normalising images to a common standard for comparison. For example, it’s not uncommon to image over several nights with di erent camera orientations or even image scales. For comparative purposes WinJUPOS provides a function to bring images to a common measurement standard saved by the program as an Image Measurement Settings (.ims) le. is becomes the basis for other internal operations such as map generation and image de-rotation.
Open WinJUPOS and from the Program menu option, click on Celestial Body and select Jupiter. Then from the Recording menu option select Image Measurement. From the Imag. tab in the window that appears, click Open image (F7).
Adjust the outline frame to match Jupiter’s limb and orientation. Arrow keys move the outline; N rotates clockwise; P rotates counterclockwise; PgUp enlarges; PgDn shrinks; and Space rotates by 180°. Use LD compensation to brighten the planet’s limb if required.
Some capture programs allow you to record movie sequences with filenames that are recognised by the WinJUPOS image measurement function, autopopulating the required inputs presented. Alternatively, enter the image values under the Imag. tab as required.
Record as an .ims file via the Imag. tab’s Save button. Repeat for next (if any) capture images. It is recommended that once the outline frame has been set, it’s left unadjusted for similar images from the same session.
Select the Adj. tab. Ensure the Draw outline frame box is ticked. Press F11 (or select Automatic detection of outline frame from the right-click menu) to align the frame to the image. Adjustments can be applied (step 4) if the frame is misaligned or upside down.
The Opt. tab allows adjustment for non-standard sensors and image orientations. In addition, the focal length and aperture size can be defined to create an accurate scientific record of the capture stored in the saved .ims file.