ChristianGrattan
TPF Noob!
- Joined
- May 16, 2012
- Messages
- 59
- Reaction score
- 5
- Location
- New York City
- Can others edit my Photos
- Photos OK to edit
I have to admit something. I am having a love affair with the histogram. We first met on the back of my camera over 10 years ago, and it had been getting stronger ever since.
I love the histogram so much that I cant imagine I world without her. She is my secret weapon for perfect exposure.
I was shooting a job on Saturday with a second shooter. I was reviewing his shots and one looked a bit off. I asked to see the histogram, and he said youre one of those histogram people with disdain. I was shocked. Who doesnt LOVE the histogram?
After I calmed down I realized that he might not know the true magic of the magic mountain. If you are like him, please indulge a fool in love.
I first fell for the histogram when I learned that the LCD on the back of my camera was a liar! I would review a shot on the back of the camera and it looked great. There was detail in the shadows and all was right with the world. When I got home and looked at the same file on a calibrated monitor it was another story. There was a walk of shame so to speak. The darks would be muddy and detail free. I would have to work to get the file to look something like it did in that LCD.
I learned not to trust the playback, but when a door closes, a window opens. In this case the window was only a press of the info button away. This got me to the histogram, and all has been right in the world ever since.
But what is the histogram and how do we read it?
The histogram shows how many pixels there are in different parts of the image. These parts are the shadows, mid-tones, and highlights. The higher the mountain is in a part of the graph the more information there is in that part of the images. So an image with lots of dark areas will have a histogram with the peak of the mountain in the shadow section of the graph. The shadow section is on the left side of the graph, the mid-tones are in the middle and the high lights are on the right.
In the image below we see both the preview of the image and its histogram. You can see that there are no bright whites or very dark areas in the shot. The histogram is concentrated in the middle of the bottom axis. This tells us that the information in the images is mostly in the middle with a slight elevation in the shadows on the left side. This corresponds to the dark sweatshirt and shadows in the foliage in the background. This is a perfectly exposed image and the histogram shows that.
Depending on the general lightness or darkness of the scene we are shooting, a properly exposed image will have a different looking histogram. A light image like the dog on a beach below, has more information in the highlights and the mid-tones than the image above. In a darker image, say one with lots of shadows, the histogram will have more information on the left side of the graph. Perfectly exposed images will have different histograms depending on the scene being shot.
There are times however when we dont get a perfectly exposed image. What does the histogram look like then? Well, before we go deep into this, we should stop and say that learning how to read a histogram takes a bit of practice. With these guidelines, you will be up to speed in a short time.
You need to take your scene into consideration when analyzing the histogram. However if you look at the image below you can see that the mountain should reach both sides of the graph. The under exposed image can be worked on in PP to make it acceptable but it is not an optimal situation. The over exposed image is trickier.
When the mountain goes past the edge of the graph it means that there is no more information being recorded. The right edge of the graph corresponds to where the printer is not putting out any more ink on the paper. This is paper white. The far left is where the paper is getting the maximum amount of black ink it can get. Going past the edge means that information is lost. See below.
This loss of information is called clipping. This is why the camera has the highlight alert. This is when the light parts of the scene flash black and white during playback. The highlight alert tells us that there is no information in that part of the image. I always shoot with the highlight alert on. There are a couple of times when its OK that the highlight alert is going off, say if you have the sun in your scene, or a candle.
Generally I like to have the mountain come up from sea level on one end of the graph and then return to sea level on the other end of the graph. Even if its only for a little bit of the graph.
By looking at the histogram you can see if your image is properly exposed for the scene you are shooting. If it is not she tells you and you can adjust till you get it right. I love her for this. This has saved me more times than I can count.
I love the histogram so much that I cant imagine I world without her. She is my secret weapon for perfect exposure.
I was shooting a job on Saturday with a second shooter. I was reviewing his shots and one looked a bit off. I asked to see the histogram, and he said youre one of those histogram people with disdain. I was shocked. Who doesnt LOVE the histogram?
After I calmed down I realized that he might not know the true magic of the magic mountain. If you are like him, please indulge a fool in love.
I first fell for the histogram when I learned that the LCD on the back of my camera was a liar! I would review a shot on the back of the camera and it looked great. There was detail in the shadows and all was right with the world. When I got home and looked at the same file on a calibrated monitor it was another story. There was a walk of shame so to speak. The darks would be muddy and detail free. I would have to work to get the file to look something like it did in that LCD.
I learned not to trust the playback, but when a door closes, a window opens. In this case the window was only a press of the info button away. This got me to the histogram, and all has been right in the world ever since.
But what is the histogram and how do we read it?
The histogram shows how many pixels there are in different parts of the image. These parts are the shadows, mid-tones, and highlights. The higher the mountain is in a part of the graph the more information there is in that part of the images. So an image with lots of dark areas will have a histogram with the peak of the mountain in the shadow section of the graph. The shadow section is on the left side of the graph, the mid-tones are in the middle and the high lights are on the right.
In the image below we see both the preview of the image and its histogram. You can see that there are no bright whites or very dark areas in the shot. The histogram is concentrated in the middle of the bottom axis. This tells us that the information in the images is mostly in the middle with a slight elevation in the shadows on the left side. This corresponds to the dark sweatshirt and shadows in the foliage in the background. This is a perfectly exposed image and the histogram shows that.
Depending on the general lightness or darkness of the scene we are shooting, a properly exposed image will have a different looking histogram. A light image like the dog on a beach below, has more information in the highlights and the mid-tones than the image above. In a darker image, say one with lots of shadows, the histogram will have more information on the left side of the graph. Perfectly exposed images will have different histograms depending on the scene being shot.
There are times however when we dont get a perfectly exposed image. What does the histogram look like then? Well, before we go deep into this, we should stop and say that learning how to read a histogram takes a bit of practice. With these guidelines, you will be up to speed in a short time.
You need to take your scene into consideration when analyzing the histogram. However if you look at the image below you can see that the mountain should reach both sides of the graph. The under exposed image can be worked on in PP to make it acceptable but it is not an optimal situation. The over exposed image is trickier.
When the mountain goes past the edge of the graph it means that there is no more information being recorded. The right edge of the graph corresponds to where the printer is not putting out any more ink on the paper. This is paper white. The far left is where the paper is getting the maximum amount of black ink it can get. Going past the edge means that information is lost. See below.
This loss of information is called clipping. This is why the camera has the highlight alert. This is when the light parts of the scene flash black and white during playback. The highlight alert tells us that there is no information in that part of the image. I always shoot with the highlight alert on. There are a couple of times when its OK that the highlight alert is going off, say if you have the sun in your scene, or a candle.
Generally I like to have the mountain come up from sea level on one end of the graph and then return to sea level on the other end of the graph. Even if its only for a little bit of the graph.
By looking at the histogram you can see if your image is properly exposed for the scene you are shooting. If it is not she tells you and you can adjust till you get it right. I love her for this. This has saved me more times than I can count.