Val Sakhnenko sigue con sus investigaciones explorando el mundo HDR Submarino y ha publicado dos nuevos vídeos con sus ajustes para Final Cut.

Val Sakhnenko continues his investigations exploring the HDR Underwater world and has released two new videos with his settings for Final Cut.

El mundo HDR submarino está en los comienzos de la exploración de las técnicas de filmación y de gradación de color HLG . Cada autor va encontrando sus técnicas y sus ajustes, en función de cómo quiere que se vea su producto final.

The underwater HDR world is at the beginning of the exploration of HLG filming and color grading techniques. Each author finds his techniques and adjustments, depending on how he wants his final product to look.

HDR HLG es una inmersión visual que introduce al espectador en el mundo que desea su autor.

Lo mismo que un director de cine y de fotografía busca el estilo y el look que quiere dar a su producción, cada productor submarino ha de buscar el suyo propio.

La exploración y el estudio de sus herramientas y el desarrollo de sus particulares formas de filmación dará carácter a su obra y estilo a su producto final.

HDR HLG is a visual immersion that introduces the viewer to the world that its author wants

Just as a cinematographer and cinematographer seeks the style and look that he wants to give to his production, each underwater producer must seek his own:

the exploration and study of his tools and the development of his particular forms of filming It will give character to your work and style to your final product.

Como decían en B&H N. Y. en un artículo que puse en una de mis entradas sobre HLG :
«Hoy en día una imagen sin HDR es como un día sin Sol»

As they said in B&H N. Y. in an article I put in one of my posts about HLG:
«Today an image without HDR is like a day without Sun»

Val nos ofrece, en su primera experimentación con la imagen HLG submarina, los parámetros de ajustes y exportación HLG para quien use FCPX pueda experimentar el apasionante mundo de la imagen submarina HLG.

Val offers us, in his first experimentation with underwater HLG imaging, HLG settings and export parameters for those who use FCPX to experience the exciting world of underwater HLG imaging.

Partiendo de imágenes de su última exploración en un viaje a RAJA AMPAT, capturadas en con la magnífica cámara Profesional Sony XDcam HDR NX 80, Valera hace un etalonaje desde las imágenes a 8 bits de profundidad de color 4.2.1 de cuantificación para sistema NTSC a 100 Mbps y 30 Ftps ,experimentando con las herramientas que ofrece hoy FCPX.

Starting from images of his last exploration on a trip to RAJA AMPAT, captured in with the magnificent Professional Sony XDcam HDR NX 80 camera, Valera grades from images at 8-bit color depth 4.2.1 for NTSC system to 100 Mbps and 30 Ftps, experimenting with the tools that FCPX offers today.

Os dejo sus vídeos subidos para Youtube en HLG para visualizar en Smartv compatibles y para visualizar en Smartv SDR y los ajustes que él ha experimentado para que mucha gente más pueda experimentar y mejorar sus imágenes submarinas.

I leave you his videos uploaded for YouTube in HLG to view compatible Smartv and to view Smartv SDR and the adjustments he has undergone so that many more people can experience and improve their underwater images.

Sin duda alguna, en el mundo se distinguen los pioneros que abren camino y no tienen miedo a experimentar de los que solamente hablan y no hacen otra cosa.

Hay que experimentar, dejarse de teorías sobre cómo deben de ser ó pueden ser las cosas, de hablar sin demostrar, arriesgarse para obtener buenos resultados .

La pasión que tienen los pioneros , personas de acción , quienes se adentran en lo desconocido, nunca podrán tenerla los que se quedan cómodamente sin experimentar ni probar nada. La incapacidad de los envidiosos a veces es como una rémora que se quiere transportar de quién es más poderoso. Siempre hay que recordar en realidad :» La envidia es el halago del mediocre «

The passion that pioneers have, people of action, those who delve into the unknown, can never have those who stay comfortably without experiencing or trying anything. The inability of the envious is sometimes like a hindrance that wants to be transported from who is more powerful. Always remember in reality: «Envy is the compliment of the mediocre»

Without a doubt, in the world the pioneers who lead the way and are not afraid to experiment are distinguished from those who only speak and do nothing else.

You have to experiment, stop theories about how things should be or can be and talk without demonstrating, to obtain good results.

Como decía nuestro célebre poeta Antonio Machado: «Caminante, son tus huellas el camino y nada más; caminante, no hay camino, se hace camino al andar. Al andar se hace camino y al volver la vista atrás se ve la senda que nunca se ha de volver a pisar. Caminante no hay camino sino estelas en la mar…»

As our famous poet Antonio Machado used to say: «Walker, your footprints are the path and nothing else; walker, there is no path, the path is made by walking. By walking you make the path and when you look back you see the path that never was he must tread again. Wayfarer there is no path but wakes in the sea … «

Enhorabuena y gracias por compartir tus conocimientos Val.

Congratulations and thank you for sharing your knowledge Val.


Val says:

«Inspired by discussion triggered by my PREVIOUS POST on this topic, and after watching an interview with Alister Chapman, I experimented with HLG footage a bit more  (without a special HDR Monitor).  This time, rather than converting HLG clips to Rec.709 clips, I created a new video in true HLG format, to see how it would work for both HDR and SDR TVs.

 I actually ended up creating two versions of the same video.  Both versions were created with the same Video Codec:

  •  ‘HDR TV’ version – in this version I wanted to see what would be the quality of the video without any color grading (okay, almost no color grading)
  • ‘SDR TV’ version – in this version I did some minimal color grading to get an image quality on an SDR screen similar to the one an HDR screen (in my subjective opinion).  

I selected several video clips that I shot in HLG (BT2020 color space) at different depths (from 5 m to 35 m) and did the following (mostly following Apple’s recommendations):

1.    Created a library in FCPX and set it to  Wide Gamut HDR

2.    Imported all clips to this library

3.    Slightly adjusted Midtones by lowering brightness to -0.1 (this what I understand Alister Chapman has recommended)

4.    Slightly adjusted Hue vs Hue of Hue/Saturation Curve of a few clips to change water color from greenish to blueish.

5.    Slightly increased sharpness (3.78)

6.     Applied HDR Tool (PQ Output Tone Map)

7.    Shared the project as a Master File, using Video Codec: Apple ProRes 422 and Wide Gamut HDR – Rec. 2020 HLG color space

8.    Uploaded the Master file to YouTube

As you can see from the above steps, I basically did not do any color grading, and all above steps took me only about 5 to 10 min, as I was using adjustment layers, to which I applied most adjustments, rather than to individual clips.   

Here is the LINK to the ‘HDR TV’ version of the video. 

When I watched this video on the my HDR TV (Samsung Q80R, 2019) I was quite impressed with its quality.  

Then, I watched the same video on my old plasma TV and a 2-year old HDR TV, on iMac, on MacBook Pro (2018), on iPhone X, and on my new Dell laptop (2020). I noticed that colors on these screens got ‘washed out’ a bit, compared to colors on my HDR TV.   So, I decided to create another version of this video (‘SDR TV’ version), in which, in addition to the above steps 1 to 8, I  made the following adjustments to increase contrast and brightness:

1.    Increased brightness of Highlights up to +0.21

2.    Decreased brightness of Shadows down to -0.22 for some clips

3.    Increased saturation of Midtones slightly

As a result, I got a video with quality  quite comparable to the ‘HDR TV’ version (in my humble opinion).  As such, it appears that for people who do not watch YouTube videos on an HDR TVs  the second version (‘SDR TV’) would work better. 

Here is the LINK to the ‘SDR TV’ version of the  video.

Most probably, quality of this second video could be improved further by making some additional adjustments, but I already see that shooting in HLG underwater could produce very good quality videos (at least to my taste) without much grading and without a special HDR monitor.

I should note, however, that I am not sure how good could be quality of underwater footage shot in HLG picture profile using other cameras.  With SONY cameras like the one I have  (Sony FDR-AX700 / HXR-NX80 / PXW-Z90), it is very easy to set manual white balance underwater with just one click, and I did it for every single shot.  Sometimes, however, when there is not much ‘white’ color in a scene to be used by the camera for reference, you have to experiment a bit, and this is where the mastery is.  I am not there yet, and I need to practice more to improve this skill.

Also, I would like to mention that I am not an expert in HLG, and if anyone is interested in learning more about advantages of HLG I would refer to experts like Alister Chapman.  

If you would like to learn more about using HLG in underwater videography, I would refer you to J. M. Núñez’s WEBSITE.  Juan has tonnes of experience in shooting HLG underwater, and his website is full of very useful and practical information and tips.

Please share your opinion about picture quality of the two versions of my video on HDR and SDR screens when you have time.

Thank you all.  Stay home and stay healthy».   By VALERA SAKHNENKO

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