definitive test - DPChallenge Forums

10/05/2005 03:53:59 PM · #1

Having taught colour to physics students for many years I would like to offer a simple yet definitive test for complementary colours.

1. Open the pic in your image editing program. - Choose invert - the complementary colour will be shown - any two complementary colours should simply swap places.

2. for expert users - open pic in image editing program - duplicate layer - invert - choose difference blending mode - should be pure white.

3. try it with your entry to complementary colours

Have fun - be scared by your own entry - open your mind not just your eyes.

Canon EF-S 18-55mm f/3.5-5.6 USM

10/05/2005 04:46:12 PM · #2

Originally posted by p2jvr:

Having taught colour to physics students for many years I would like to offer a simple yet definitive test for complementary colours.

gee... w/ all this talk of compl-E-mentary and compl-I-mentary in this challenge, you'd think more people could spell the word color right... especially a professor of physics...

i mean... come on... what's with all the U's?

;) hehe

danica22

Canon EOS-350D Rebel XT

10/05/2005 04:52:27 PM · #3

in some places in the world, such as South Africa, colour is spelt with a u

Riponlady

Panasonic Lumix DMC-FZ35

Tamron AF 28-300mm f/3.5-6.3 XR Di LD Aspherical IF for Canon

10/05/2005 04:54:30 PM · #4

removed -posted in error

Message edited by author 2005-10-05 16:55:40.

vtruan

Nikon D5100

Tamron AF 28-80mm f/3.5-5.6 Aspherical for Nikon

10/05/2005 04:56:32 PM · #5

And Strangehost picked the color chart as a favoritte, now that's interesting.

10/05/2005 04:57:32 PM · #6

Originally posted by kudzu:

i mean... come on... what's with all the U's?

"U" - the grade I most enjoy giving to the class clowns
;) hehe

10/05/2005 04:58:25 PM · #7

Originally posted by danica22:

in some places in the world, such as South Africa, colour is spelt with a u

which would be the point of my previous joke and the impetus for the gratuitous inclusion of the winky and the laugh...

now that _that's_ all cleared up... let's talk about your faulty conjugation of "to spell"...

yeesh.

10/05/2005 05:01:13 PM · #8

A favourite - now that's changed the whole outlook and made my day
Thanks strangehost

Tamron AF 28-300mm f/3.5-6.3 XR Di LD Aspherical IF for Canon

10/05/2005 05:03:07 PM · #9

Originally posted by p2jvr:

Originally posted by kudzu:

i mean... come on... what's with all the U's?

"U" - the grade I most enjoy giving to the class clowns

well... in college, i believe i made a C in physics... mainly due to my equally poor showing in calculus, which showed up towards the end of the semester on a physics final, much to my surprise... attending the actual class lectures might have prepared me better. go figure.

Riponlady

Panasonic Lumix DMC-FZ35

10/05/2005 05:04:47 PM · #10

Originally posted by kudzu:

Originally posted by danica22:
in some places in the world, such as South Africa, colour is spelt with a u

which would be the point of my previous joke and the impetus for the gratuitous inclusion of the winky and the laugh...

now that _that's_ all cleared up... let's talk about your faulty conjugation of "to spell"...

yeesh.

ROFLAO!!!!!

danica22

Canon EOS-350D Rebel XT

Canon EF-S 18-55mm f/3.5-5.6 USM

10/05/2005 05:05:18 PM · #11

sorry kudzu... bit slow tonight :)

Canon EF-S 10-22mm f/3.5-4.5 USM

10/05/2005 05:07:01 PM · #12

Originally posted by kudzu:

Congratulations on the "C".
I might have awarded an O+ (read out loud quickly - O plus) ;)

Message edited by author 2005-10-05 17:07:59.

srdanz

Canon EOS-5D Mark IV

10/05/2005 05:08:11 PM · #13

From the dictionary:

spell
v. spelled, or spelt (splt) spell·ing, spells
v. tr.
To name or write in order the letters constituting (a word or part of a word).
To constitute the letters of (a word): These letters spell animal.
To add up to; signify: Their unwise investment could spell financial ruin.

So, spelt is just fine...

so, who has complementary and who has complimentary colo(u)rs in the challenge?

10/05/2005 05:11:09 PM · #14

Originally posted by srdanz:

so, who has complementary and who has complimentary colo(u)rs in the challenge?

From the comments I've received to date - mine is far from complimentary

Tamron SP AF 28-75mm f/2.8 XR Di for Canon

10/05/2005 05:18:13 PM · #15

Originally posted by p2jvr:

Congratulations on the "C".
I might have awarded an O+ (read out loud quickly - O plus) ;)

nice... i was hopeless enough to decide that a degree in engineering wasn't in my future.

strangeghost

Canon EOS-7D

10/05/2005 05:19:45 PM · #16

Originally posted by p2jvr:

A favourite - now that's changed the whole outlook and made my day
Thanks strangehost

;-)

drz01

Pentax K50

Pentax SMC DA 18-55mm f3.5-5.6 AL WR

10/05/2005 05:25:30 PM · #17

Originally posted by kudzu:

Originally posted by p2jvr:
Having taught colour to physics students for many years I would like to offer a simple yet definitive test for complementary colours.

gee... w/ all this talk of compl-E-mentary and compl-I-mentary in this challenge, you'd think more people could spell the word color right... especially a professor of physics...

i mean... come on... what's with all the U's?

;) hehe

Every other country in the world uses the "U" in colour USA dropped the "U" in colour, neighbour and man other words to save on ink when printing

10/05/2005 05:25:30 PM · #18

Originally posted by danica22:

sorry kudzu... bit slow tonight :)

sure... i understand... otherwise you'd know it's the middle of the day and not night time yet...

i keep trying to figure out why everyone doesn't speak [spelt?] like me and convert to my time zone... i am still the center of the universe, right?

;)

10/05/2005 05:26:06 PM · #19

To strangeghost
Apologies for getting your name wrong - I failed to check my sources

10/05/2005 05:27:55 PM · #20

Originally posted by kudzu:

i am still the center of the universe, right?

;)

actually it's the space between the v and the e -

Nikon AF-S Nikkor 18-70mm 1:35-4.5G ED

10/05/2005 05:51:36 PM · #21

Originally posted by p2jvr:

Originally posted by kudzu:
i am still the center of the universe, right?

actually it's the space between the v and the e -

hmm... guess that would really depend on the type font used and the kerning value and such, now wouldn't it?

more exactly, i think it's probably the space between my ears...

HVGB_photos

Nikon D3100

10/05/2005 06:01:02 PM · #22

Thanks, John, for describing that "definitive test" for complementary colours...

I found that students who had learned "subtractive" complementary colours (for paints and pigments) had trouble when they were shown "additive" complementary colours (for light... particularly computer monitors.)

Try the test and see!