New Tool: HDRComposition

[vicent_peris]

Hi Vicent,

I suppose with blooms you have no choice but to replace the bloom with short exposure background or truly making stuff up. In both cases though the pixels aren't comparable to their neighbors. If there are faint targets hidden by blooms they will not become visible with short exposures. The only real solution is to use ABG sensors

Yes, but it's far better to cover the blooms with real data than with completely synthetic data. Yes. this real data is weak, but real. Some of the stars and other objects under the blooms will appear. Also, if your bloom is over a nebula, you will recover valuable data of it.


Regards,
Vicent.

[Niall Saunders]

Thanks again for another excellent tool to add to our PI toolboxes.

However, I am still waiting for that DeClouder and DeMooner script - any news

[RobF2]

Yes, thanks for another wonderful tool.
I've been really looking forward to "Orion season" this year, and perfect timing to make such a practical tool available    

[astropixel]

The speed is phenomenal. Two questions though. What are optimal settings for terrestrial shots? Should I first calibrate daylight images?

This is the result of HDRcomposition of RAW images.

[Carlos Milovic]

If you are working with raw, linear data, it doesn't matter. Since color calibration at this point is just a scale factor (multiplicative factor), you may apply it to the result, or the individual frames, with the same result.

Having said that, it would be easier for the algorithm to replace saturated data, and to merge the data with similar SNR if you calibrate after the HDR composition.

[vicent_peris]

The speed is phenomenal. Two questions though. What are optimal settings for terrestrial shots? Should I first calibrate daylight images?

This is the result of HDRcomposition of RAW images.

Hi,

This algorithm is designed to work with calibrated data. In daylight, as exposure times are very short, you don't need to subtract thermal noise. Also, if all the HDR exposure set is done with the same aperture value, you don't need to correct vignetting. But you must always correct all the image set by subtracting bias.

Just a note: to me it seems that you're making the HDR composite image with bayer matrix images. You must debayer all the images before making the HDR composition.


Best regards,
Vicent.

[astropixel]

Thanks Carlos and Vicent.
I'll have to take some bias frames for this particular camera.
Debayering was the solution. A bit too much colour saturation may be?

[vicent_peris]

Hi,

did you apply HDRWT to this image?

I think you can raise a bit more the midtones because the foreground objects are very dark.


V.

[astropixel]

Not to the previous image. This one has HDRWT 2 layers 5x5 Gausian to luminance with deringing, plus a saturation and RGBK curve and additional colour saturation.

[vicent_peris]

Hi,

better would be to use more layers. With only two layers you are having too much contrast in the sea, over the reflected Sun light.

OTOH, after HDRWT is better to use curves to enhance colors, because HDRWT mutes the color saturation of the highlight areas. Do a curve to saturate only the color of the less saturated pixels.


Regards,
Vicent.

[astropixel]

Thanks Vicent. I think this one is a lot better. I'm almost tempted to write up a small tutorial for the procedure.

I've created and calibrated the images with a master bias, debayered, HDRComposition, SCNR green channel, HDRWT 6 layers 5x5 gaussian to luminance with a mask and deringing, a bit of saturation with CurveTransformation in H, b and RGBK, and that's it.

The only point, is that the colours could be saturated more or the contrast increased I suppose. Depending on personal preference.

[Carlos Milovic]

Now you nailed it Looks terrific!

[astropixel]

'bout time  Thanks again to all

[vicent_peris]

Hi,

try this process icon set. I made it from your first posted image. Remember to read the texts inside each process icon (small red button).

It's all I can do with your JPEG.


Regards,
Vicent.

[astropixel]

Vicent - thanks so much. I'll try those over the weekend.