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Mastodon: AboutGet the appKeyboard shortcutsView source codev4.4.0-nightly.2025-04-01

#brightness

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TJ
Mind The Brightness, Please. (February: Retinitis Pigmentosa Awareness Month, 2025)

For this Friday, I've decided to post this shot which I've taken last week using UV filter (and using my modified camera for full-spectrum photography). Initially, it was just an experiment really, since I didn't shoot in UV in a long time. UV photography is quite hard, way harder than infrared photography, for technical issues and considerations. For this reason, using high ISO in my case is a must (and hence more grain).
Initially, I've shot this as an experiment. I wanted to apply a technique that "almost" blowout the highlights (working with the histogram delicately here). Then, as I was working on the effect, it occurred to me how much I struggle with brightness in real life.
For people who read about RP, the impression is that patients of RP would need a lot of light; which is true. However, such brightness can be "blinding" in the sense of not being able to adapt and discern details. A real-life example: The kitchen at home is completely white and around the middle there is a support beam, which is also painted white, beside other white things. Roaming the kitchen can be tricky at times (especially when, my eyes show flyers or flashes) and I often need to pause a little to adjust my perspective in this space. It is not uncommon for me to head directly into that beam, because I didn't see the edges clearly.
Patients of RP, generally speaking, retain low-contrast vision and that makes them slow to move around, especially around the stairs where feeling the steps by foot is a must. For this reason, I wear polarizing shades over my glasses to help add contrast; though it doesn't work all the time, but it was/is definitely a must when driving during the day (something I don't do much right now anyway), and also around the house, in the yard specifically.

#RP #RetinitisPigmentosa #UV #ultraviolet #bright #brightness #awareness #February #visuallyimpaired #eyes #goodmorning
#goodmorning
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C.

@0xabad1dea

Agree with someone else: my screens are set at the minimum possible brightness.

The general rule of thumb is that your screen should be approximately the same brightness as a white piece of paper held at the same distance. Less than that, and you invite eyestrain, more than that you get the "OMG my corneas have sunstroke".

#ergonomics#brightness#display
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IRAP

[V347 Aur, a #lighthouse in the galaxy] Some stars, like V347 Aurigae, vary greatly in #brightness over short time scales. But why? How? The answer with #SPIRou, the infrared spectropolarimeter installed on the #CFHT : irap.omp.eu/en/2024/10/spirou-

Around the #protostar V347 Aurigae orbits a brown dwarf of 30 Jupiter masses. Its elliptical trajectory invites the two bodies to periodically move towards and away from each other, generating #instabilities in the #disc of matter that envelops and feeds the nascent binary system. The fall of #matter onto the protostar results in a temporary increase in its luminosity by a factor of 100. Periodic light bursts captured by the SPIRou instrument.

Disk and accretion of matter within a double protostar observed with the ALMA radio telescope. This double protostar, different from V347 Aur (whose brown dwarf companion is 10 times less massive than the central star), illustrates the complexity of matter flows from the disk to the stars within a protobinary. V347 Aur is far too close to its brown dwarf companion to be similarly imaged by ALMA. ALMA / ESO / NRAO / NAOJ, Alves et al 2019
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