resizing and naming photos for competition · 2016-10-19 · bridgewater photographic society...
TRANSCRIPT
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Resizing and
Naming Photos for
Competition
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Q1: The projector has a display resolution of 1024x768, but what does this mean?
768
1024
A1: It defines the maximum pixel width [1024], and the pixel height [768] that can be displayed.
A pixel is a single controllable element, with colour and intensity. The colour of each element is made up of Red, Green, Blue (RGB) or Cyan, Magenta, Yellow, blacK (CMYK) depending upon the output device.
Ratio: 1024 / 4 = 256pix 256 x 3 = 768pix
Mpix: 1024 x 768 = 0.786Mpix
Let’s start with some Theory
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Your camera captures the image on a digital sensor.
What is a Mega Pixel?
The sensors are of various physical sizes, ratios, and Mega Pixel capacities.
What Physical Sizes? What is a Ratio?
Sensor Full Frame Full Frame Full Frame APS-C APS-C APS-C Micro Four Thirds 1.5 Inch 1/3 inch
Physical Size 36.0mm x 24.0mm 36.0mm x 24.0mm 35.9mm x 24.0mm 23.5mm x 15.7mm 22.3mm x 14.9mm 23.5mm x 15.6mm 17.3mm x 13.0mm 18.7mm x 12.5mm 4.89mm x 3.67mm
Ratio 3:2 3:2 3:2 3:2 3:2 3:2 4:3 3:2 4:3
Mega Pixels 30.4 (6720 x 4480) 22 (5616 x 3744) 24.9 (6016 x 4016) 20.9 (5568 x 3712) 18 (5184 x 3456) 24.2 (6000 x 4000) 16.28 (4608 x 3456) 12.8 (4352 x 2904) 8 (3264 x 2448)
Camera Canon 5D MKIV Canon 5D MKII Nikon D750 Nikon D500 Canon 7D Nikon D5500 Olympus OM-D E-M1 Canon G1X MKII iPhone 6Plus
Canon 5D MKII -> 5616 x 3744 = 21.026 Mpix
How to Calc the Mega Pixels? How to Check the Ratio?
Canon 5D MKII -> 5616 / 3 = 1872pix x2 3744pix
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Ratio 3:2
An Example of a arbitrary sensor
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Q2: How can I figure out the Ratio?
x/y 1.0 1.5 1.333 1.25 1.4 1.273 1.778
Ratio 1:1 3:2 4:3 5:4 7:5 14:11 16:9
Some Size Examples Square, 10x10, 12x12, 16x16 4x6, 8x12, 12x18, 16x24, 20x30, 24x36 12x16, 18x24, 24x32, 30x40 4x5, 8x10, 16x20 5x7, 20x28 11x14 16x9
Example using the Canon 5D MKII sensor size: 5616 / 3744 = 1.5
Looking at the table above we see the ratio = 3:2
Example using a Laptop (Dell 7520) Display: 1920 / 1080 = 1.778
Looking at the table above we see the ratio = 16:9
Example using our Projector: 1024 / 768 = 1.333
Looking at the table above we see the ratio = 4:3
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Q3: If the projector has a maximum capability to display 1024 x 768, am I forced to crop my image to a 4:3 ratio?
A3: No. The 1024 pix horizontal and 768 pix vertical are the maximum. For example: If you chose to use a 3:2 ratio “Landscape” orientation image, the final image size would be 1024 pix x 683 pix. As a result the photo does not use all the available pixels, however the image stills displays ok.
Unused Pixels
1024
768 683
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Q4: How does the projector display a “Portrait” orientated image?
A4: As an example: if the “Portrait” orientated image was a 2:3 ratio, the maximum pixel limitation is the vertical 768 pixels. Your resulting 2:3 ratio image would end up being 512 pix wide x 768 pix high. The result is ½ the horizontal pixels are being used.
Q3 & Q4 are some of the considerations to think about when choosing the photo type and ratio which determines the parameters to resize your photo.
1024
768
512
Unused Pixels
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Q5: What does resizing do to the photo? A5: Once you have completed processing your photo it is typically much larger than the size to display on the projector for competitions. When you resize, the software will use a sophisticated algorithm to change the pixels of your image to the size specified. There are two types; “reduction” and “enlargement”. The choice for competition is typically reduction.
The resulting photo may no longer be as sharp due to the resulting pixels produced by the algorithm. Therefore, you may wish to sharpen after the photo is resized. Note that the perceived sharpness depends upon the distance from and magnification used when viewing the photo.
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Q6: What does it mean to view a photo at 100%?
A6: Viewing a photo at 100% is to match the photo pixel to the display’s pixel (ie. 1:1 pixel mapping), or in other words the resolution being equal to the original. If you are viewing a photo that is 1024pix x 768pix on a computer display that has a resolution, for example, of 1920pix x 1080pix, the photo will only take up part of the screen at 100% and it’s not recommended to zoom in beyond that point.
If you zoom in further than 1024 x 768, the software uses an algorithm to enlarge the photo and the resulting photo on the display will not be a true representation of the origional.
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Q7: What role does the “Resolution” (pixels per inch) play when I am reducing or enlarging a photo?
A7: If you are specifying the export size in pixels, the “pixels per inch” is only used in the calculation for the “size” of the photo in the meta data and does not have anything to do with the pixels in the photo itself. The inherent ratio of the photo is used to calculate the unspecified dimension. If you are specifying the export size in inches, the “pixels per inch” is used to calculate the resulting pixel dimensions of the photo.
Assume the ratio is 3:2 (1024/3)x2=683px The photo will be 1024x683 pixels The size in the metadata: 1024/300=3.41” wide 683/300=2.28” high
Assume the ratio is 3:2 3.413x300=1024px (3.413/3)x2x300=683px The photo will be 1024x683 pixels The size in the metadata: 3.41” wide (3.41/3)x2=2.28” high
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Q8: From what distance should I be viewing a photo?
A8: It depends on the size of the display and the resolution based on what the human eye can see. The minimum viewing distance should be around 1.5 to 2 times the diagonal size of the photo. The 3438 constant is the quality that the human eye requires for edges to appear smooth.
3438 ppi (pix per inch) =
vd (viewing distance)
15.5” 16:9
13.5625”
7.5625”
Resolution = 1920px X 1080px = 2.0736Mpix
With a 15.5” laptop display and the 1920x1080 pixel resolution the closest viewing distance should be: ppi = 1920/13.5625 = 141.57 ppi vd = 3438/141.57 = 24.28 inches Check the rule [15.5x1.5]: 3438/23.25”= 147.87 ppi Check the rule [15.5x2]: 3428/31”= 110.58 ppi
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60” 4:3
48”
36”
Resolution = 1024px X 768px = 0.7864 Mpix
48^2 + 36^2 = 60”
Q9: From what distance should I be viewing a photo displayed using a projector?
A9: See the math below:
Viewing distance should be: ppi = 1024/48 = 21.33 ppi vd = 3438/21.33 = 161.18 inches (13.43ft) Check the rule [60x1.5]: 3438/90”= 38.2 ppi Check the rule [60x2]: 3428/120”= 28.6 ppi
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How to Name Photos for Competition
October 22: Deadline for Treasure Hunt Photos (100-metre Challenge). Send your 5 (maximum) images to [email protected]. 1024x768 jpegs, named TH1_Image Title_Firstname Lastname ... TH5_Image Title_Firstname Lastname. Images should have been taken between September 13 and October 22, 2016, and within your home, or within 100 metres of your property. Image subjects are open.
Example of an email message you will receive from [email protected]:
The important part to extract from this message is how to name your photo:
TH1_Image Title_Firstname Last Name
TH1_Blue Jay Ballet_Trevor Awalt.jpg
This presentation shows you where to rename your photos within the resizing examples in the following slides.
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Examples included of software titles for Processing and Resizing Photos
Lightroom CC – Adobe Picasa – Google On1 Photo 10 – On 1 Inc IrfanView – Freeware Photoshop CC – Adobe
Note: the software below is not a complete list of all titles available
Photoshop Elements - Adobe Aperture – Apple (no longer supported) Paintshop Pro – Corel Aftershot Pro – Corel Capture One Pro – PhaseOne Gimp – Freeware
Examples of other software titles for Processing and Resizing Photos
Software All Examples are Shown Using Windows
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How to Resize using Lightroom (File -> Export)
JPG Quality = 98% dpi = as chosen from the export dialogue
PI2_Field Of Corn_Trevor Awalt
PI2_Field Of Corn_Trevor Awalt.JPG
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How to Resize using Picasa (File -> Export Picture To Folder)
JPG Quality = 93% dpi = 72
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Don’t forget to Change The Name with Picasa!
NA1_Where Is My Lunch_Trevor Awalt
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How to Resize using On1 Photo 10 (File -> Export)
JPG Quality = 100% dpi = as chosen from the export dialogue
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How to Resize using IrfanView (Image -> Resize/Resample)
JPG Quality = 100% dpi = as chosen from the export dialogue
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Don’t forget to do a “Save As” with IrfanView!
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How to Resize using Photoshop (File -> Save for Web)
JPG Quality = 98% dpi = 96
NA2_What Ya Doin_Trevor Awalt
NA1_Where Is My
Lunch_Trevor A...
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Note: Photoshop inserts “-” instead of a “space”
Use Windows Explorer to replace the “-” with spaces to fix the file name!
How to Resize using Photoshop (File -> Save for Web)
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How to Resize using Photoshop Recommended Steps
1. Set the colour space to sRGB
2. Set the colour bit depth to 8 bits
3. Adjust image size to 1.67 times the final size
4. Sharpening (create 2 duplicate layers and sharpen each layer)
5. Adjustments
6. Save JPG file
Check the source colour space [Edit -> Convert to Profile] If not sRGB change it
[Image -> Mode -> 8 Bits/Channel]
[Layer -> Duplicate Layer], [Filter -> Sharpen -> Sharpen] [Layer -> Duplicate Layer], [Filter -> Sharpen -> Sharpen] [Image -> Image Size] <-Note: check Resample Bicubic Sharper (reduction) Click on top “Duplicate Layer” (Background Copy 2) and change “Opacity” to 70%
Calculate the Pixels. Be careful of image ratios of 4:5 (8x10), if you use longest edge your pixels will be too big. For example: (1024/10)x8=819 result greater than 768. Instead calc based on shortest edge: (768/8)x10=960 result will work ie. <= 1024. Now calc 1.67 times: 768x1.67=1282 result the interim size will be 1282x1603 [(1282/8)x10)=1603.
[Image -> Image Size] <-Note: check Resample Bicubic Sharper (reduction)
[Layer -> New Adjustment Layer -> Levels] Note: change midtone to 0.97 [Layer -> New Adjustment Layer -> Hue/Saturation] Note: change saturation to +8
[File -> Save As] Note: Select Folder + Type Filename + Save As Type = JPEG, and set Quality = 12
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How to Resize using Photoshop Step 3
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How to Resize using Photoshop Step 4
Set Opacity to 70% After Resize
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How to Resize using Photoshop Step 5
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How to Resize using Photoshop Step 5 continued
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How to Resize using Photoshop Step 6
JPG Quality = 98% dpi = as chosen from the export dialogue
PO1_Can I Play Too_Trevor Awalt
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Final Checks!
Check The File Size and
Name
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Final Checks!
Check The Pixel Size