admin wrote:Using your stacking solution (for example DSS), try stacking one data set using the other as a reference. This way you'll have perfectly aligned images and the same dimensions. Does this help?
Alvinillo wrote:I have a question, isn't it better to stack all those exposures in a single fit? DSS already does that using groups
Entropy Weighted Average (High Dynamic Range)
This method is based on the work of German, Jenkin and Lesperance (see Entropy-Based image merging - 2005) and is used to stack the picture while keeping for each pixel the best dynamic.
It is particularly useful when stacking pictures taken with different exposure times and ISO speeds, and it creates an averaged picture with the best possible dynamic. To put it simply it avoids burning galaxies and nebula centers.
Note: this method is very CPU and memory intensive.
When imaging an object with high dynamic range on a DSLR camera, it may be necessary to combine images taken with different exposure lengths, and different ISO settings to reduce the saturation of brighter portions of subjects, while keeping fine detail in dimmer regions. The ISO level can be controlled through the Sensitivity selector.
ML7087373 wrote:admin wrote:Using your stacking solution (for example DSS), try stacking one data set using the other as a reference. This way you'll have perfectly aligned images and the same dimensions. Does this help?
I don't know. I'll have to look into that. My first impression is that, as I dither my lights, the stacking artifacts in each stack will always be different yielding different dimension lights. I'll have to give it a try and see if I can use that angle to make it work.
i´ve got a question about this, i found where in DSS i could set the Reference picture to alingn at.
For example i have 15x 90 sec and 15x 270 sec
So i stack the first 15 with 90 sec and then i should take the result of the stack to the 270 sec stack and set as reference? The 90 sec stack won´t be included in the new 15x 270 sec stack? I´ve searched for a option to take the last star alignment, but didn´t found an option, in the DSS documentation i couldn´t find an answer too (eventually i searched false) .
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