Hi all,
Today we completed another important milestone in this project: the definition of the processing workflow that will correct the gradients in the images. I want to show you a nice result on an image acquired at 400 mm focal length and a QHY600 camera.
Here we have the original image, a field around NGC1333:
The workflow we have designed is very reliable. In this case, the image is completely covered by dusty nebulas and there are gradients of multiple colors. If you look carefully, you'll even see a violet band on the bottom margin, coming from two different telescope pointings with two different gradients. Our workflow can correct these gradients, as shown below:
Though this technique is not designed to correct sharp gradients like the one at the bottom, it almost corrects it (only a thin violet edge is visible). This correction has been carried out with our experimental DSLR reference data.
Lastly, this technique is going to redefine the concept of black point in astrophotography. As you can see, the background in the resulting image above is brownish. This is not a lack of background neutralization, but the result of having an all-sky background reference. This will allow us to take into account the color pedestal imposed on the entire image by the local environment of the image.
Of course, we can always apply the traditional background neutralization technique that always refers to an area inside the image. This gives a more neutral result, capable of digging into the different hues of the dust inside the picture:
The same stretching and curves have been applied to the three images.
Best regards,
Vicent.
Today we completed another important milestone in this project: the definition of the processing workflow that will correct the gradients in the images. I want to show you a nice result on an image acquired at 400 mm focal length and a QHY600 camera.
Here we have the original image, a field around NGC1333:
The workflow we have designed is very reliable. In this case, the image is completely covered by dusty nebulas and there are gradients of multiple colors. If you look carefully, you'll even see a violet band on the bottom margin, coming from two different telescope pointings with two different gradients. Our workflow can correct these gradients, as shown below:
Though this technique is not designed to correct sharp gradients like the one at the bottom, it almost corrects it (only a thin violet edge is visible). This correction has been carried out with our experimental DSLR reference data.
Lastly, this technique is going to redefine the concept of black point in astrophotography. As you can see, the background in the resulting image above is brownish. This is not a lack of background neutralization, but the result of having an all-sky background reference. This will allow us to take into account the color pedestal imposed on the entire image by the local environment of the image.
Of course, we can always apply the traditional background neutralization technique that always refers to an area inside the image. This gives a more neutral result, capable of digging into the different hues of the dust inside the picture:
The same stretching and curves have been applied to the three images.
Best regards,
Vicent.
