Change river color to blue

Discussion in 'Photoshop Tutorials' started by Benny, Jun 23, 2007.

  1. Benny

    Benny Guest

    How can I change the colour of a river from brown to blue. I have PS CS2.

    For example

    This river is definitely brown. How was it made to appear blue? (by the
    way - it is not the sky reflected off the river).


    Benny, Jun 23, 2007
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  2. I can think of several reasons to not emulate what's been done with the
    sample photo, but depending on the scene you might be able to use the
    replace color feature. (It won't work where sky meets sea)

    Others require masking, at least the ones I am thinking of. Do you know
    how to use masks?
    John McWilliams, Jun 23, 2007
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  3. Benny

    Fat Sam Guest

    Open the image.
    Convert to LAB colour mode.
    Select everything from the horizon down.
    Open the channels pallette.
    highlight the "b" channel.
    Convert back to RGB and save.

    This converts the river from blue back to brown, so it's pretty afair to
    assume that a similar (or the same)process was used to convert the river
    from brown to blue.
    Fat Sam, Jun 23, 2007
  4. Benny

    Somebody Guest

    Use quick mask mode to mask off the water, create a new layer fill your
    mask/selection on the new layer with blue, then change the layer blending
    mode to color. Drop the layers opacity if need be.
    Somebody, Jun 23, 2007
  5. Benny

    tacit Guest

    Geez. Everyone's given suggestions that'll work (some more readily than
    others), but everyone's taking the long, convoluted way 'round. What,
    are people frightened for hte Curves command?

    Select the river and use Imge->Adjust->Curves.
    tacit, Jun 23, 2007
  6. Benny

    Benny Guest

    Thanks John
    Yes I can use masks.
    I will also try out some blend modes with a blue fill layer - not sure if
    this might work too.
    Benny, Jun 24, 2007
  7. Benny

    Benny Guest

    Thanks FS, I'll give that a try.

    Benny, Jun 24, 2007
  8. Oh, yeah! Now we know that Benny isn't unfamiliar with PS, all these
    make sense.
    John McWilliams, Jun 24, 2007
  9. Benny

    Benny Guest

    That works fine, thanks.
    Just one thing with Quick Mask.
    If I have a large area to mask I brush around the border to give a red mask
    border. How do I then quickly fill the insides of that border without having
    to brush over the whole area. I tried using the bucket but it didn't fill
    the area correctly. There seems to be some feathering that doesn't fill
    Benny, Jun 24, 2007
  10. Benny

    Fat Sam Guest

    Use a bigger brush to fill the area.
    Switch from Quick Mask back to normal mode and use the lassoo tool to select
    the rest of the area.
    Fat Sam, Jun 24, 2007
  11. Benny

    Voivod Guest

    Make a REALLY big brush...
    Voivod, Jun 24, 2007
  12. Or, next time, make the big easy selection first, then use quickmask to
    feather out the edges.
    John McWilliams, Jun 24, 2007
  13. Benny

    tacit Guest

    Select it with the lasso and fill it by pressing Alt-Delete on your
    tacit, Jun 24, 2007
  14. Benny

    Alan Browne Guest

    Wait for a day with a clear blue sky and take the photo so that the
    river reflects the blue.

    For example:

    See, real easy!

    Alan Browne, Jun 25, 2007
  15. John McWilliams, Jun 25, 2007
  16. Benny

    Somebody Guest

    Sorry it took me so long to respond. The suggestions you got from the others
    are right on the money. I always use a small brush to edge the area and then
    use a large one to quickly fill in. It is important to remember that if you
    are using a soft edge brush that you need to overlap the outline strokes a
    bit so that you don't get a soft line going around it. It is because of this
    that I don't use the bucket tool to fill in.

    Somebody, Jun 28, 2007
  17. Benny

    tacit Guest

    You can solve this problem with incredible speed just by outlining the
    area you wish to fill in the quick mask using the lasso tool, then
    holding down the ALT key on your keyboard and pressing the DELETE key.
    ALT-DELETE is the Photoshop command to fill an area with the foreground
    color. In Quick Mask, this fills in the selected area. No brush

    Using the paintbrush to fill in large areas is time-consuming and
    tacit, Jun 29, 2007
  18. Benny

    Warren Sarle Guest

    Or CTRL-DELETE to fill with the background color.
    Warren Sarle, Jul 3, 2007
  19. Benny

    Rhonda Guest

    I've selected areas before and changed the color quickly by using the
    hue/saturation slider.

    Rhonda, Aug 1, 2007
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