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White A/C Cause Rejection Problems  
User currently offlinePaulc From United Kingdom, joined Mar 2001, 1490 posts, RR: 0
Posted (13 years 2 days 10 hours ago) and read 1594 times:

just an observation regarding some pictures i have had rejected and the associated warnings.

Scenario :
Bright day, ramp access , side on shot of an aircraft which is mainly white but with a dark, wide cheatline - sun is from the left and shining on top of fuselage which causes shadow of aircraft on ramp.

Picture is scanned and manipulated to get what i consider the best result and submitted.

Picture accepted  Smile

Click for large version
Click here for full size photo!

Photo © Paul Chandler

but with warning
a) picture dark in tone etc.... and
b) scanned with too high contrast.

My question is - (i use photoshop btw) if i try to alter the contrast ie reduce it - it also affects the brightness and vice versa (catch 22) . The white fuselage especially in sunlight gives a slightly false impression of high contrast but equally creates a dark shadow.

Any suggestions ? or is it a case of just playing with settings



English First, British Second, european Never!
6 replies: All unread, jump to last
 
User currently offlineYKA From Netherlands, joined Sep 2001, 766 posts, RR: 0
Reply 1, posted (13 years 2 days 9 hours ago) and read 1541 times:

The lighting in the photo above looks ok, however one thing I noticed about alot of your photos is that they are brightened too much, resulting in the "hazy" look to the pictures. If the photo is correctly exposed, as the one above is then no brightness adjustments should be neccesary. If the photo does need some tweaking, then use the "gama" tool instead. Just my $00.02

User currently offlineYKA From Netherlands, joined Sep 2001, 766 posts, RR: 0
Reply 2, posted (13 years 2 days 9 hours ago) and read 1534 times:

Here, I played around with the shot(I hope its not againts a.net rules) and came up with this result(resized for quick viewing). Turn out I had to crank the contrast up to 28(in PP7).

(ORIGINAL)

(ALTERED)


User currently offlineJwenting From Netherlands, joined Apr 2001, 10213 posts, RR: 18
Reply 3, posted (13 years 2 days 8 hours ago) and read 1531 times:

I too have had a lot of rejections for "too much contrast" and "too dark".
I've taken to uploading many shots a bit brighter and less contrasty than I like them, seems to work.
Either someone has his screen set too dark, or I have mine too bright  Smile/happy/getting dizzy
The accepted one looks awfully hazy to me, the altered one a lot better (but would probably be rejected for "too much contrast").



I wish I were flying
User currently offlinePaulc From United Kingdom, joined Mar 2001, 1490 posts, RR: 0
Reply 4, posted (13 years 2 days 8 hours ago) and read 1520 times:

YKA / Jwenting

thanks for your quick replies - i will try loading shots a bit brighter / less contrasty.

I will reload the YKA altered one >g and see what result that gives but it looks to have too much contrast.

thanks again
Paulc



English First, British Second, european Never!
User currently offlineCkw From UK - England, joined Aug 2010, 742 posts, RR: 16
Reply 5, posted (13 years 1 day 20 hours ago) and read 1483 times:

I strongly suggest you use neither the "brightness" or "contrast" controls to change a scanned image.

Why? If you have scanned correctly, your image SHOULD have the optimum "white point" and "black points" set. (Ie. the brightest part of the pic is pure white, the darkest pure black). Now, if you increase brightness, all that happens is that all the pixels are brightened a few levels ... this means pixels that were nearly white become pure white and blacks become dark gret. Not good. Similar things happen using the contrast control.

The best thing to do is use "tone curve" - this allows you to selectively adjust the midtones without disturbing the black and white values - manipulating the tone curve also lets you increase/decrease contrast without affecting exporsure.

Alternatively, use the "gamma" control to brighten/darken midtones. - easier to use than tone curve, but less powerful.

Cheers,

Colin



Colin K. Work, Pixstel
User currently offlinePaulc From United Kingdom, joined Mar 2001, 1490 posts, RR: 0
Reply 6, posted (12 years 12 months 4 days 8 hours ago) and read 1455 times:

Colin,

thanks for your advice - unfortunately my scanner always seems to produce a 'dark' image even if the slide is ok so this has to be corrected before i do anything else to it.

The 'tone curve' - is that on the colour balance screen ?



English First, British Second, european Never!
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