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De Para

1. Abrir a imagem que se quer transformar num desenho. No meu caso utilizei esta.
2. Duplicar a imagem LAYER > DUPLICATE LAYER...
3. Agora seleccionar a imagem duplicada e ir a FILTER > SKETCH > PHOTOCOPY
4. Inserir os seguintes atributos DETAIL: 1 e DARKNESS: 50 . Clicar OK.
5. Agora ir ao menu IMAGE > ADJUSTMENTS > DESATURATE
6. Por fim, e isto é completamente opcional, criar um NEW ADJUSTMENT LAYER (no menu LAYER) e escolher CURVES...
7. Nos settings das CURVES, inserir 176 no OUTPUT e 63 no INPUT.
8. Voilá! Esta é uma técnica mesmo muito simples e qualquer pessoa pode faezr em menos de 3 minutos. O resultado final é este.

De para

1. brightness & contrast
duplicate base > set to screen at 50% - 100%, depending on your base [*i set mine to 60%]
duplicate base again > drag it to the top of all layers > set it to luminosity at 70%
~ this will even out the contrast and add a pretty luminance

2. color fill layers
layer > new > layer > set to soft light and fill with the color #cca5a5 at 100% opacity
layer > new > layer > set to exclusion and fill with the color #121700 at 100% opacity
~ adds a pink & blue tint which gives the image a vintage look

3. selective coloring
layer > new adjustment layer > selective coloring at 100% opacity
red: 100, 0, 100, 42
yellow: -100, 0, 100
cyan: 100, 0, -100, 100
blue: 100, 0, -100, 100
white: -100, -28, -100
black: 0, 0, 0, 100
~ darkens your image and adds more yellow

4. more selective coloring
layer > new adjustment layer > selective coloring at 100% opacity
red: -100, 37, 2
yellow: 4, 4, 17, -10
cyan: 0, 0, 0, -100
blue: 0, 0, 0, -100
neutrals: 10
blacks: 100, 0, 0, 100
~ adds reds and lightens your blues

5. color balancing
layer > new adjustment layer > color balance at 100% opacity
midtones: -20, -6, 18
shadows: -17, -17, -12
highlights: -19, 4, 25
~ balances yellows and gives whites a blue tint

6. even-ing it out
layer > new > layer > set to exclusion and fill with the color #170e00 at 100% opacity
layer > new > layer > set to luminosity and fill with the color #02aeb4 at 20% opacity
layer > new > layer > set to darken and fill with the color #b6b59e at 10% opacity
duplicate base > drag to the top of all layers > set to soft light at 80% opacity
~ gives more saturation and darkens the image just a tad to even it out

7. finishing touches
layer > new adjustment layer > selective color at 100% opacity
red: -25
yellow: -19, 0, -38
neutrals: 0, 0, -12
~ removes excess yellow and tones up the reds a notch

Download do .PSD

to or

1. curves layer (layer > new adjustment layer > curves)
RGB: input: 100 output: 143

this layer is meant to lighten the picture slightly, don't worry if it's still too dark/dull.

2. another curves layer.
RGB: input: 119 output: 126
red: input: 140 output: 150
green: input: 132 output: 130
blue: input: 122 output: 130

this layer is to add a little bit of color to the picture, as there wasn't much color in it before.

3. selective color layer (layer > new adjustment layer > selective color)

reds: -36, +6, +4, -5
yellows: +10, -4, -15, 0
whites: +45, -21, +17, 0
neutrals: +1, 0, 0, 0

this layer gave some parts of my image a very slight green tone, but it's mostly to increase the red tones.

4. another curves layer (last one, unless you're going for the second result.)

RGB: input: 170 output: 190

this lightens the picture; you may not need this layer. my image was dark, so it was needed. you can always play with the opactiy of the layer too.

5. channel mixer layer (layer > new adjustment layer > channel mixer)

red: +128, -40, +5
green: +6, +88, 0
blue: -55, +55, +90 constant: +8

this add most of the final color, as the image is now bluer like it is in the first result.

6. color fill layer (layer > new fill layer > solid color)

#D5D5D5, color burn 100%

this layer will add some contrast to the picture.

***IF YOU'RE JUST DOING THE COLOR PART, STOP HERE***

7. gradient map layer.

pick the one that is going from black to white.

this will turn your picture black and white.

8. levels layer. (layer > new adjustment layer > levels)

RGB: 0, 0.88, 255

this adds some contrast.

9. another curves layer (last one)

RGB: input: 171 output: 185

Download do PSD

to

1. Curves layer. (layer >> new adjustment layer >> curves) You might not need this layer if your picture is light enough, since it's like a screen layer.

RGB: 142, 172


2. Selective Color layer. (layer >> new adjustment layer >> selective color) If this layer makes your picture too red, play with the opacity of it.

Reds: -100, +29, +52, 56
Neutrals: +23, +3, -15, 0
Blacks: +33, 0, 0, -11

3. Channel Mixer layer. (layer >> new adjustment layer >> channel mixer) This adds some blue to the picture since the last layer added a lot of red.

Red: +128, -40, 0
Blue: -55, +60, +100

4. Curves layer. Lightens the picture a bit more.

RGB: 106, 130

5. Duplicate layer, drag to the top of layers and set it soft light 30-100% opacity. I just think this makes it look better in the end. ;)
 

examples of this coloring:

Brevemente o PSD

to:

1. Selective Color (Reds): -100, 0, +100, 0 (Neutrals): +20, 0, 0, 0.
2. Hue/Saturation: (Master) Saturation: +40.
3. Curves: (RGB) 1 Point: 61, 91 2 Point: 127, 162.
4. Color Balance: (Midtones) -13, -30, -26

Download do .PSD

Vamos de  para

1. Abre a tua base. Cria um novo layer com a cor #EACE9D, e muda para multiply 45%

2. curves
RGB; 129, 153

3. channel mixer layer

r; +136, -40, -2
b; -36, +58, +90

4. color balance layer.

midtones; -15, -15, -15
shadows; +16, -10, +23

5. hue/saturation layer

master; 0, +5, 0
reds; -3, +6, 0
yellows; -2, +14, +7
magentas; +3, 0, 0

6. selective color layer.

r; -17, -16, -31, 0
y; -15, +20, -12, 0
n; +45, -18, -23, 0

Outros exemplos:

 
Download do PSD

Vamos de para

Passo 1: duplica a tua imagem e muda para screen entre 40 e 50%

Passo 2:
selective colour layer -
reds: +20, +40, +30, +15
yellows: +50, -20, -30, -20
whites: +20, -15, -20, +20
neutrals: -10, -12, -7, -5

Passo 3:
Duplica o teu selective colour layer e muda para soft light a 30%

Passo 4:
curves layer -
green: [point 1] input 74, output 106 ; [point 2] input 182, output 189
blue: [point 1] input 128, output 155
(set this layer to overlay - 50%)

Passo 5:
selective colour layer -
reds: -5, +5, -5, -5
yellows: +50, -10, -10, -20
neutrals: +15, +5, -6, 0

Passo  6:
channel mixer layer -
red: +130, -35, +3
green: -10, +110, +2
blue: -20, +25, +95

Outros exemplos com o mesmo tratamento

   

Download do PSD

De para

1 - Abre a imagem

2 - LAYER > NEW ADJUSTMENT LAYER > CURVES

Mexe no pontinho até te aparecer em baixo INPUT e OUTPUT no valor de

INPUT 195

OUTPUT 228

3 - LAYER > NEW ADJUSTMENT LAYER > COLOR BALANCE

-50, 0, 26

4 - LAYER > NEW ADJUSTMENT LAYER > HUE/SATURATION

No menu MASTER põe a SATURATION com 39

No menu YELLOW põe a SATURATION com -70 (número negativo)

Mais exemplos:

Download do .PSD

De para

1. Abre a foto.

2. New adjustment layer > Color balance
Midtones: +20, 0, -13
Shadows: 0, 0, -9
Highlights: +7, 0, -3
Preserve Lumi is checked

3. New adjustment layer > Brightness/contrast
B: +10
C: -7

4. New adjustment layer > Selective color
Reds: C -83, M 0, Y +23, B +48
Yellows: C -45, M 0, Y +55, B +32
Cyans: C +100, M 0, Y +100, B +100
Blues: C +100, M 0, Y -100, B +100
Whites: C 0, M 0, Y +20, B +24
Neutrals: C +24, M 0, Y -21, B +8
Blacks: C -20, M 0, Y -17, B +21

5. New adjustment layer > Selective color
Reds: C -100, M 0, Y +48, B +22
Yellows: C -100, M 0, Y -100, B +46
Cyans: C +28, M -100, Y +100, B -47
Whites: C +24, M 0, Y +9, B -17
Neutrals: C -10, M 0, Y 0, B +3
Blacks: C +27, M 0, Y -14, B 0

6. New adjustment layer > Curves
RGB
Point one: I 68, O 62
Point two: I 152, O 164

7. Usa esta textura e muda para screen 100%

8. Usa esta textura e muda para multiply 75%

9. Usa esta textura e muda para screen 100%

Outros exemplos:

Download do .PSD

De para

1. Abre a tua imagem.
2. Duplica a imagem LAYER > DUPLICATE LAYER e muda para SCREEN. Põe a percentagem 70%.
3. Faz um novo layer LAYER > NEW LAYER com a cor #A39CA6 e muda para COLOR BURN a 100%.
4. LAYER > NEW ADJUSTMENT LAYER > CURVES

RGB: 
Input: 124
Output: 120

REDS:
Input: 123
Output: 108

5. LAYER > NEW ADJUSTMENT LAYER > Hue/Saturation e muda o Master saturation para +26%.
6. LAYER > NEW ADJUSTMENT LAYER > Selective Colouring

REDS: -100 / -37 / 100 / 55
YELLOWS: 100 / 100 / 100 / -100
NEUTRALS: 17 / -13 / -15 / 4

OPCIONAL

7. Selecciona um brush de 1px e faz as riscas á volta da pessoa.

Download do .PSD