Difference between revisions of "GIMP/C2/Adjusting-Colours-Using-Layers/English-timed"

| Welcome to Meet the Gimp. My name is Rolf Steinort and I’m recording this in Bremen, Northen Germany.  

|In the previous edition I got this image here after editing

|And today I think I should do something to set the colors.

| Because this image is too green.

|There are lot of ways to adjust the color and one of them is the Curve Tool.  

|I click on the curves tool in tool box and then I select the green channel and pull the curve down.  

|I don’t want to use curves tool because it damages the details of the image and I can’t correct the damage afterwards  

|I could use the undo tool but I’ll have to redo all the steps after that.

|So I want to have something that’ll not damage the image and I can adjust later on.

| There is such a way which uses a simple filter with layers

|So I have open here the layer dialog.

| You’ll see here background which is our original image.

| And I simply add a new layer and I select white in Layer Fill Type and give it a name, color correction green.  

|The layer mode is an algorithm which combines the two layers i.e the original background layer and the newly created layer.

|So I choose here the Multiple mode.   

|And you get the original image back as it was before.  

|The Multiply mode, multiplies the pixels from the background to the pixels from the foreground, and divides the result by 255.  

|And in a white picture all the color channels are 255, so multiplying by 255 and dividing by 255 gives the starting point i.e. Background

|Now i want to select such a color which has a reduced green channel.  

|Here I have black as foreground colour, which i  change to background colour and white as foreground colour and you can see that red, green & blue all colour channels have same value i.e 255.  

|By the way don’t be distracted by the colours on the slider here.

| This is not blue, this is yellow but when I slide this down to a certain point, you see that colours in all the slider change automatically.  

|Ok I select the green slider here and pull the slider to say something around 211.

|But I can adjust the intensity of my green reduction with the help of the opacity slider.

| And when I go back to zero I get the old image, and when I pull the slider up I can reduce the green channel in the image and also avoid getting magenta into the image.  

|By using the layers tool I can do changes anytime I want to and also I can do fine adjustments when more layers are stacked onto it and the change will stay even if I change something in underlying picture.

|Again I follow the same procedure and make a new layer and called it color correction blue.

|For adding blue in the image, I use the Screen mode which is a little bit more complicated than Multiply mode.  

|In screen mode the colors are 1st inverted and then multiplied and divided and quite complicated.  

|Let me change the foreground colour to black and add the colour  i want to add directly and now I have to add a little bit of blue

| So slide down the blue slider a bit.

|This here is supposed to be blue, which looks still like black but it is very dark blue.

| Look at the image here and when I switch this off, you see the change

|When I click on the 1st layer we see the reduced channel of green and when I click on 2nd layer it adds a bit blue colour.  

| I can adjust it later on all the time.  

|The layer tool is very powerful because you can create layer upon layers and in each layer you can change the pixels which are coming up from the lower layer  

|Perhaps here you can slide the opacity slider a bit down to get a good colour and you can play with these sliders which gives real hand full of possibilities to change the color here.  

|I think I have to cover the layer tool in detail on a special show but for today this is enough.  

|This is Hemant Waidande dubbing for the Spoken Tutorial project and I hope to see you around next time.