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Comparing seemingly identical images


From:

Photoshop Masking and Compositing: Advanced Blending

with Deke McClelland

Video: Comparing seemingly identical images

One of the great uses for the Difference mode is that it allows you to compare seemingly identical images and discover their differences. And here's how that works. We are looking at a photo from Fotolia image library, I absolutely love it because it's a great demonstration of Blend Modes, we have got this photograph in the background, then this falling type in the foreground set to the Screen mode I would imagine, in order to create this bright interaction. The name of the file is Access codes. tiff so I save the image to the tiff file format, I use LZW compression, which is entirely lossless.
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  1. 1m 43s
    1. Welcome
      1m 43s
  2. 33m 16s
    1. When in doubt, blend
      2m 20s
    2. Where to find blending options
      4m 10s
    3. 27 blend modes, 6 groups
      4m 23s
    4. Opacity vs. Fill Opacity
      4m 41s
    5. The "Fill Opacity Eight"
      4m 59s
    6. Blending adjustment layers
      4m 43s
    7. Blend mode shortcuts
      8m 0s
  3. 27m 3s
    1. The power of standardized arithmetic
      6m 58s
    2. Photoshop's blending formulas
      5m 27s
    3. Darken formulas vs. lighten formulas
      4m 15s
    4. Contrast mode formulas
      7m 28s
    5. Inversion, cancelation, and HSL
      2m 55s
  4. 17m 50s
    1. Normal mode vs. Dissolve mode
      2m 11s
    2. Making a dynamic Dissolve effect
      2m 21s
    3. Creating a Dissolve text effect
      4m 48s
    4. The Behind and Clear modes
      3m 2s
    5. Filling a stroke with Behind and Clear
      5m 28s
  5. 43m 25s
    1. Darken vs. Darken Color
      4m 25s
    2. Creating filter effects with Darken
      5m 0s
    3. The Multiply and Burn modes
      6m 27s
    4. Cleaning up scanned line art
      7m 30s
    5. Comping line art against a photo
      5m 12s
    6. Colorizing comped line art
      5m 15s
    7. Masking with a darken mode
      3m 59s
    8. Refining a mask with Multiply
      5m 37s
  6. 33m 37s
    1. Lighten vs. Lighter Color
      2m 29s
    2. Creating filter effects with Lighten
      2m 47s
    3. The Screen and Dodge modes
      4m 35s
    4. Blending white type, darkening shadows
      3m 3s
    5. Creating a classic double-exposure effect
      3m 49s
    6. Making dark line art bright
      5m 11s
    7. Masking with a lighten mode
      5m 4s
    8. Refine, filter, and blend
      6m 39s
  7. 35m 18s
    1. Overlay, Soft Light, and Hard Light
      5m 2s
    2. Vivid, Linear, and Pin Light
      4m 2s
    3. The amazing Hard Mix mode
      3m 51s
    4. Two variations on a single mode
      5m 37s
    5. Adding clarity with a contrast mode
      4m 9s
    6. Creating a glowing, soft-focus effect
      3m 38s
    7. Blending an image with a paper texture
      4m 11s
    8. Turning flesh into stone
      4m 48s
  8. 18m 10s
    1. Difference, Exclusion, Subtract, and Divide
      7m 7s
    2. Comparing seemingly identical images
      3m 25s
    3. Creating type that inverts any background
      3m 30s
    4. Making inversion type black and white
      4m 8s
  9. 16m 57s
    1. Luminosity, Color, Hue, and Saturation
      3m 29s
    2. Colorizing artwork with layers
      7m 24s
    3. Correcting skin tones with Hue
      6m 4s
  10. 14m 57s
    1. Using the This Layer slider option
      6m 44s
    2. Using the Underlying Layer slider option
      3m 16s
    3. Achieving greater control with Blend If
      4m 57s
  11. 48s
    1. Next steps
      48s

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Watch the Online Video Course Photoshop Masking and Compositing: Advanced Blending
4h 3m Intermediate Nov 28, 2011

Viewers: in countries Watching now:

Advanced Blending is the second installment in Deke McClelland's series on making photorealistic compositions in Photoshop. The course explores blending options and shows how to use them to create sophisticated effects and seamless compositions, often without masking. Beginning with the basics of blending layered images, the course sheds light on the formulas behind the Photoshop blend modes and shows how to comp scanned line art, create double-exposure effects, correct skin tones, and work with the luminance sliders.

Topics include:
  • Assembling dynamic Dissolve effects
  • Filling and stroking with Behind and Clear
  • Cleaning up and compositing scanned line art
  • Understanding the darken, lighten, and contrast modes
  • Refining a mask with Multiply and Screen
  • Creating a glowing, soft-focus effect
  • Blending images with textures
  • Comparing two seemingly identical images
  • Creating type that inverts everything behind it
  • Colorizing artwork with layers
  • Achieving greater control with the Blend If option
Subject:
Design
Software:
Photoshop
Author:
Deke McClelland

Comparing seemingly identical images

One of the great uses for the Difference mode is that it allows you to compare seemingly identical images and discover their differences. And here's how that works. We are looking at a photo from Fotolia image library, I absolutely love it because it's a great demonstration of Blend Modes, we have got this photograph in the background, then this falling type in the foreground set to the Screen mode I would imagine, in order to create this bright interaction. The name of the file is Access codes. tiff so I save the image to the tiff file format, I use LZW compression, which is entirely lossless.

So it doesn't change a single pixel inside the image. Meanwhile, next-door, it looks like the same image; we will see that it's not in a moment. It's called Heavily compressed.jpg, and what I did was, I save that same file to the JPEG format, and I applied the lowest quality setting possible, which is 0. And as a result, if you go and zoom in on this image, you can see that we have all kinds of compression artifacts, they show up as these 8x8 pixel squares, and basically all of the pixels are rewritten, based on the color of the top left pixel and that's how JPEG works.

Now let's say we want to get a sense of what exactly has change between these two images. Well, I am going to right click inside this image and choose Duplicate Layer and then send it over to Access codes.tiff and change its name to let's say JPEG version and click OK. And now we'll switch back to the image at hand. To compare the two, I will go ahead and change the Blend Mode from Normal to Difference. Now first it's going to look like the image is gone completely black, so there must not be any differences between the pixels, because identical pixels set to the Difference mode cancel each other out.

However, that's not actually the case. So what I am going to do is press the Escape key to deactivate the Blend mode there. And I'm going to create a Merged version of these two layers by pressing Ctrl+Shift+Alt+E or Command+ Shift+Option+E on the Mac. We will go ahead and create a merged composite on a new layer. I will go ahead and call this new layer Merged as well. Now what you need to do is go up to the Image menu, choose the Adjustments command and choose Levels or you can press Ctrl+L, Command+L on the Mac and look at that histogram, there is some action going on in the very dark regions of this layer.

To make it evident, go ahead and grab that white slider triangle and move it very far over to the left hand side. And I am going to ultimately settle on a white point value of 20. So that we have a fair amount of distinction going on here and then I will click OK. Any pixel at this point that does not appear black has been rewritten, which means that applying a lot of JPEG compression in our case, has rewritten just about every single pixel in the image.

So any time you want to be able to compare two seemingly identical images and figure out if they are truly the same thing, then you can do this exact same tests we did here, using the Difference Blend Mode, going ahead in merging the two layers and then using the Levels command to exaggerate the differences.

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