Quiz: Spot the hot dot - DPChallenge Forums

Canon EF 17-40mm f/4.0L USM

01/05/2009 05:29:25 PM · #1

Since I couldnt ignore this one nasty bright hot pixel in the new camera sensor, I thought lets share it and lets all have some fun.

So heres a recent picture. All you have to do is spot the hot pixel and report its co-ordinates (X, Y):

The first one to report the correct numbers shall receive Prash's good eyes (virtual) trophy. You may not use a hot-pixel-finder software (hard to enforce, but I trust you;-), there are no other rules.

The time starts... NOW.

P.S. In case someone wants to make this thread more interesting, you can post your own hot-pixellated image here after this one. Just a hint.

ETA: The co-ordinates must be in full / original image resolution space.

Message edited by author 2009-01-05 17:30:38.

Ecce_Signum

Canon EOS-5D Mark II

01/05/2009 05:32:51 PM · #2

I'll hazard a guess at 2675, 1842 but you really shouldn't worry about a single pixel, nokin certainly won't care.

01/05/2009 05:38:55 PM · #3

Originally posted by Prash:

ETA: The co-ordinates must be in full / original image resolution space.

How we s'posed to do that off a downsized sample?

R.

01/05/2009 05:39:22 PM · #4

Originally posted by Ecce Signum:

I'll hazard a guess at 2675, 1842 but you really shouldn't worry about a single pixel, nokin certainly won't care.

Wow! You came reallly close. Only that this is a vertically oriented image, so considering top left of the image as the origin, the co-ordinates are different.

You may still win this..close... lol:-)

01/05/2009 05:40:27 PM · #5

Originally posted by Bear_Music:

Originally posted by Prash:

ETA: The co-ordinates must be in full / original image resolution space.

How we s'posed to do that off a downsized sample?

R.

Robert, you can view full sized image from the photo page. There should be a link below the photo. In fact here it is.

see

Canon PowerShot S95

01/05/2009 05:43:09 PM · #6

X= .0890
Y=2.192
Did I do something wrong?

01/05/2009 05:46:08 PM · #7

Originally posted by alans_world:

X= .0890
Y=2.192
Did I do something wrong?

Oh no! You flunked it!:-)

I would be happy with integer level accuracy.

Ecce Signum is the closest yet.. not quite there though.

01/05/2009 05:48:05 PM · #8

2450 x 2675

ETA: I'm not used to reading the coordinates at such fine detail, let me make sure I have transcribed accurately...

ETA: 2448.5 x 2675.5 :-)

Message edited by author 2009-01-05 17:50:30.

01/05/2009 05:50:23 PM · #9

Originally posted by Bear_Music:

2450 x 2675

Rob, you are sooooooooooo close. Plus there is a swapping involved (X <-> Y).

Now Bear is the closest:-)

01/05/2009 05:52:58 PM · #10

Originally posted by Bear_Music:

2450 x 2675

ETA: I'm not used to reading the coordinates at such fine detail, let me make sure I have transcribed accurately...

ETA: 2448.5 x 2675.5 :-)

OK I will give you that> Only I would swap X/Y.

Amazing!! In 15 minutes we have an answer!

Congrats Bear! :-)

ETA: I didnt think it would be this fast.. now I have to design a trophy. damn! :-)

Message edited by author 2009-01-05 17:53:26.

01/05/2009 05:53:01 PM · #11

Originally posted by Prash:

Originally posted by Bear_Music:
2450 x 2675

Rob, you are sooooooooooo close. Plus there is a swapping involved (X <-> Y).

Now Bear is the closest:-)

Are you saying horizontal goes first then vertical?

so: 2675.5 x 2448.5?

R.

01/05/2009 05:54:00 PM · #12

Originally posted by Bear_Music:

Originally posted by Prash:

Originally posted by Bear_Music:
2450 x 2675

Rob, you are sooooooooooo close. Plus there is a swapping involved (X <-> Y).

Now Bear is the closest:-)

Are you saying horizontal goes first then vertical?

so: 2675.5 x 2448.5?

R.

You got it Bear!!!!!!! See my previous post.

I envy your vision!

01/05/2009 05:57:35 PM · #13

On this day of January 5, 2009, I hereby declare

Bear_Music the first ever winner of Prash's Good Eyes Award !

(Trophy on its way)

(((( Applauds ))))

01/05/2009 05:58:04 PM · #14

TY, TY... I feel so humble to have reached this peak of greatness.

Brings up an interesting question, though: I am viewing at maximum magnification, and the hot pixel maps, horizontally, to the space between 2675 and 2676, while the vertical maps to the space between 2448 and 2449: so is there a convention for naming this location? My use of the .5 markers locates the center of the hot pixel, but when the maximum possible resolution is 1 pixel, it seems silly to be using half-pixel markers...

R.

Message edited by author 2009-01-05 17:58:36.

see

Canon PowerShot S95

01/05/2009 05:58:48 PM · #15

AGGGGGG, just a little late

01/05/2009 05:59:32 PM · #16

Originally posted by Bear_Music:

Yes you make a good point. We really dont need to go sub pixel unless we are interpolating. In this case, (X: 2675, Y: 2449) would suffice for me.

Canon EF 100-400mm f/4.5-5.6L IS

01/05/2009 06:00:07 PM · #17

Originally posted by alans_world:

AGGGGGG, just a little late

You can win the next one... only it cant be from my camera (everybody knows the answer now, silly!!!)

:-)

Message edited by author 2009-01-05 18:00:55.

Strikeslip

Canon EOS-5D

01/05/2009 06:05:26 PM · #18

The hot spot I cannot see
Blind am I so whoop dee dee
My eyes are shot
I cannot spot
Anything hot
Screw Prash's Good Eyes Trophy

Marc923

01/05/2009 06:05:41 PM · #19

From the title, I came here looking for a hot dog.

EBJones

Nikon D200

Nikon AF-S DX NIKKOR 18-200mm f/3.5-5.6G ED VR II

01/05/2009 06:24:50 PM · #20

Well, I found it. . . . then I read the rest of the thread.

I guess it's ok not to be able to beat Bear, but I really would like the last 5 minutes of my life back. :)

Gordon

RIM BlackBerry Curve

Canon EF 85mm f/1.8 USM

01/05/2009 06:26:59 PM · #21

Originally posted by Bear_Music:

top left pixel is typically pixel 0,0 (you use the upper left corner to identify them)

EBJones

Nikon D200

Nikon AF-S DX NIKKOR 18-200mm f/3.5-5.6G ED VR II

01/05/2009 06:31:32 PM · #22

And here I've been trying to analyze all of my images using the standard Cartesian coordinate system! No wonder I can't take a decent picture! I've been upside down and backwards this whole time!

eta: For what it's worth, though, I zoomed all the way in on the image and the pixel is dead center on 2675 and 2449 in CS3. This is using the rulers on the edge of the window. I agree that there shouldn't be a half pixel location for a hot pixel.

Message edited by author 2009-01-05 18:38:09.

01/05/2009 06:47:30 PM · #23

Originally posted by EBJones:

Well, I found it. . . . then I read the rest of the thread.

I guess it's ok not to be able to beat Bear, but I really would like the last 5 minutes of my life back. :)

Here... take five minutes from my life... I give you the 5 minutes that I will spend in jail one day ;-)

01/05/2009 06:48:02 PM · #24

Originally posted by Strikeslip:

The hot spot I cannot see
Blind am I so whoop dee dee
My eyes are shot
I cannot spot
Anything hot
Screw Prash's Good Eyes Trophy

:-)
:-)

You are extremely talented.