| Some stock photos:

iStockphoto.com
Stockxpert.com
Keywords: metal, plate, texture, blank, screws, rivets,
nails, cover, surface, background, edge, frame, industrial, layer, piece,
plating, protection, shine, shiny, brushed, cold, panel, urban, horizontal,
copy, space, worn, solid, line, gray, backdrop,

iStockphoto.com
Photosights.net
Shutterstock.com
Stockxpert.com
Keywords: air, beautiful, big, blue, clarity, clean,
clear, clouds, crisp, cumulous, fresh, majestic, nature, sky, vivid, weather,
heaven, paradise, background, bright, cosmos, dream, ecological, formation,
holidays, light, natural, outdoor, peace, skies, copy, space, summer,
sunny

iStockphoto.com
Photosights.net
Shutterstock.com
Keywords: rust, metal, texture, surface, hell, colour,
color, red, orange, steel, iron, decay, old, grunge, grungy, background,
corrode, corrosion, oxide, hydroxide, oxidation, ferro, backdrop,

iStockphoto.com
Photosights.net
Shutterstock.com
Stockxpert.com
Keywords: metal, texture, rust, steel, nails, hard, surface,
brown, dots, footprints, industrial, decay, grunge, grungy, pattern, background,
iron, corrode, corrosion, oxide, hydroxide, oxidation, ferro, backdrop,
rivets,

iStockphoto.com
Photosights.net
Shutterstock.com
Stockxpert.com
Keywords: registered, trademark, circle, red, white,
symbol, sign, copyright, corporate, business, tag, mark, trade, brand,
copy space

iStockphoto.com
Photosights.net
Shutterstock.com
Stockxpert.com
Keywords: decay, decayed, grunge, grungy, texture, concrete,
wall, white, black, dirt, stains, crack, industrial, urban, grey, deterioration,
dilapidation, cement, firm, horizontal, solid, stained, backdrop, background,

iStockphoto.com
Photosights.net
Shutterstock.com
Stockxpert.com
Keywords: alphabet, chaos, texture, surface, background,
paper, letters, numbers, alphanumerical, colours, contrast, fonts, ttf,
type, backdrop,

Shutterstock.com
Photosights.net
Keywords: grey, shiny, steel, metal, surface, brushed,
texture, shining, steel, background, backdrop, gray

Stockxpert.com
Shutterstock.com
Photosights.net
Keywords: wet, stop, hand, print, paint, black, metal,
grungy, yellow, grunge, surface, texture, contrast, background, individuality,
sign,

iStockphoto.com
Keywords: alarm, alert, bell, call, ding, fire, metal,
red, ring, safety, sound, round, circle, blaze, building, burn, burning,
caution, danger, department, emergency, firefighter, fireman, firestation,
firetruck, flame, heat, hot, rescue, smoke, warn, warning, security, copy,
space

iStockphoto.com
Photosights.net
Shutterstock.com
Keywords: rust, rusted, decay, decayed, grunge, grungy,
texture, metal, orange, circle, industrial, scratches, frame, round, iron,
corrode, corrosion, oxide, hydroxide, oxidation, ferro, machine, background,
surface, solid, hole, backdrop,

iStockphoto.com
Photosights.net
Shutterstock.com
Stockxpert.com
Keywords: telephone booth, box, britain, british, call, communicate,
communication, england, english, great britain, isolated, phone, public, red,
talk, telephone, traditional, uk, united kingdom,

iStockphoto.com
Photosights.net
Shutterstock.com
Stockxpert.com
Keywords: texture, grunge, grungy, plastic, decay, abstract,
brown, lines, aged, shades, background, detail, dirty, material, rough, surface,
industrial, gradiant, gradient, light, dark, backdrop,

iStockphoto.com
Photosights.net
Shutterstock.com
Stockxpert.com
Keywords: skid, mark, tyre, car, traffic, brake, zebra, crossing,
pedestrian, danger, hazard, speed, stop, slide, rubber, line, grunge, grungy,
texture, asphalt,

iStockphoto.com
Photosights.net
Shutterstock.com
Keywords: sea mine, steel, texture, metal, line, nails, war,
surface, water, ww2, world, monument, black, shadow, round, copy, space, industrial,
rivets, solid, armor, backdrop, background

iStockphoto.com
Photosights.net
Shutterstock.com
Stockxpert.com
Keywords: 1984, blue, broadcast, big, brother, camera, cctv,
closed, circuit, metal, observation, observe, optics, pole, protect, sky, spy,
steel, surveillance, television, tv, watch, crime, data, 24hour, authority, fear,
hour, information, intrusive, paranoia, paranoid, police, privacy, public, recording,
road, security, street, terrorism, terrorist, trust, video, orwell, electronic,
equipment, monitoring, network

iStockphoto.com
Photosights.net
Shutterstock.com
Keywords: flow, joint, knob, line, pipe, pipes, valve, water,
grey, connection, cooperation, screw, round, industrial, symmetric, decay, grunge,
grungy

iStockphoto.com
Photosights.net
Shutterstock.com
Stockxpert.com
Keywords: sign, empty, yellow, blue, colour, contrast, attention,
blank, inform, information, message, public, reminder, warning, ahead, business,
caution, clean, concept, danger, directing, direction, drive, guide, hazard, highway,
navigation, notice, street, text, transportation, travel, yourmessagehere, copy
space
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When I came back from a visit to Hadrian's Wall, I was quite disappointed to
see the result:

The sky is overexposed, but there's still some colour in the sky, so all is
not lost. Open the picture in Photoshop. First, go to image > calculations
Select red, normal and new document. (If you try green
and blue you'll see that the sky only gets whiter.)

Then go to image > adjust > selective color and make it blue. Select
neutrals and adjust the sliders until you have a nice blue sky. Try these
settings:

Now drag this picture onto the original picture and select multiply and
blend it.

The sky's OK now, but the ground was affected too, so we'll need to fix that.

Select the eraser tool, and set the size to 999. Let the opacity be around 40-50%

Notice that I didn't remove the horizon completely, because if I did there would
be a noticeable "halo". Better to let it be a little dark, something which also
adds to the horizon's contrast.
Finished!

Be aware that when you multiply a photo onto itself, noise may be enhanced.
Depending on the quality of your original photo, you may have to blur the new
layer. However, if the image is going to be downsized afterwards, then the noise
will go away in the process.
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