Resizing and Naming Photos for Competition Bridgewater Photographic Society 2016/17 1
Let s start with some Theory Q1: The projector has a display resolution of 1024x768, but what does this mean? 1024 A1: It defines the maximum pixel width [1024], and the pixel height [768] that can be displayed. 768 Mpix: 1024 x 768 = 0.786Mpix Ratio: 1024 / 4 = 256pix 256 x 3 = 768pix 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. Bridgewater Photographic Society 2016/17 2
Your camera captures the image on a digital sensor. The sensors are of various physical sizes, ratios, and Mega Pixel capacities. What Physical Sizes? What is a Ratio? What is a Mega Pixel? Camera Canon 5D MKIV Canon 5D MKII Nikon D750 Sensor Full Frame Full Frame Full Frame Physical Size 36.0mm x 24.0mm 36.0mm x 24.0mm 35.9mm x 24.0mm Ratio 3:2 3:2 3:2 Mega Pixels 30.4 (6720 x 4480) 22 (5616 x 3744) 24.9 (6016 x 4016) Nikon D500 Canon 7D Nikon D5500 APS-C APS-C APS-C 23.5mm x 15.7mm 22.3mm x 14.9mm 23.5mm x 15.6mm 3:2 3:2 3:2 20.9 (5568 x 3712) 18 (5184 x 3456) 24.2 (6000 x 4000) Olympus OM-D E-M1 Micro Four Thirds 17.3mm x 13.0mm 4:3 16.28 (4608 x 3456) Canon G1X MKII 1.5 Inch 18.7mm x 12.5mm 3:2 12.8 (4352 x 2904) iphone 6Plus 1/3 inch 4.89mm x 3.67mm 4:3 8 (3264 x 2448) How to Calc the Mega Pixels? Canon 5D MKII -> 5616 x 3744 = 21.026 Mpix How to Check the Ratio? Canon 5D MKII -> 5616 / 3 = 1872pix x2 3744pix Bridgewater Photographic Society 2016/17 3
Bridgewater Photographic Society 2016/17 4 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 99 X 66 = 6,534 pixels 0.006534 Mpix Ratio 3:2 An Example of a arbitrary sensor
Q2: How can I figure out the Ratio? Ratio 1:1 3:2 4:3 5:4 7:5 14:11 16:9 x/y 1.0 1.5 1.333 1.25 1.4 1.273 1.778 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 Bridgewater Photographic Society 2016/17 5
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 683 768 Bridgewater Photographic Society 2016/17 6 1024
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. Unused Pixels 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. 768 512 1024 Bridgewater Photographic Society 2016/17 7
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. Bridgewater Photographic Society 2016/17 8
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. Bridgewater Photographic Society 2016/17 9
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 Bridgewater Photographic Society 2016/17 10
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) 13.5625 15.5 16:9 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 Bridgewater Photographic Society 2016/17 11
Q9: From what distance should I be viewing a photo displayed using a projector? A9: See the math below: 48^2 + 36^2 = 60 48 60 4:3 36 Resolution = 1024px X 768px = 0.7864 Mpix 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 Bridgewater Photographic Society 2016/17 12
How to Name Photos for Competition Example of an email message you will receive from BPSexecutive@gmail.com: October 22: Deadline for Treasure Hunt Photos (100-metre Challenge). Send your 5 (maximum) images to BPSEntries@gmail.com. 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. 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. Bridgewater Photographic Society 2016/17 13
All Examples are Shown Using Windows Note: the software below is not a complete list of all titles available 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 Software Examples of other software titles for Processing and Resizing Photos Photoshop Elements - Adobe Aperture Apple (no longer supported) Paintshop Pro Corel Aftershot Pro Corel Capture One Pro PhaseOne Gimp Freeware Bridgewater Photographic Society 2016/17 14
How to Resize using Lightroom (File -> Export) PI2_Field Of Corn_Trevor Awalt PI2_Field Of Corn_Trevor Awalt.JPG JPG Quality = 98% dpi = as chosen from the export dialogue Bridgewater Photographic Society 2016/17 15
How to Resize using Picasa (File -> Export Picture To Folder) JPG Quality = 93% dpi = 72 Bridgewater Photographic Society 2016/17 16
Don t forget to Change The Name with Picasa! NA1_Where Is My Lunch_Trevor Awalt Bridgewater Photographic Society 2016/17 17
How to Resize using On1 Photo 10 (File -> Export) JPG Quality = 100% dpi = as chosen from the export dialogue Bridgewater Photographic Society 2016/17 18
How to Resize using IrfanView (Image -> Resize/Resample) JPG Quality = 100% dpi = as chosen from the export dialogue Bridgewater Photographic Society 2016/17 19
Don t forget to do a Save As with IrfanView! Bridgewater Photographic Society 2016/17 20
How to Resize using Photoshop (File -> Save for Web) NA1_Where Is My Lunch_Trevor A... NA2_What Ya Doin_Trevor Awalt JPG Quality = 98% dpi = 96 Bridgewater Photographic Society 2016/17 21
How to Resize using Photoshop (File -> Save for Web) Note: Photoshop inserts - instead of a space Use Windows Explorer to replace the - with spaces to fix the file name! Bridgewater Photographic Society 2016/17 22
How to Resize using Photoshop Recommended Steps 1. Set the colour space to srgb Check the source colour space [Edit -> Convert to Profile] If not srgb change it 2. Set the colour bit depth to 8 bits [Image -> Mode -> 8 Bits/Channel] 3. Adjust image size to 1.67 times the final size 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) 4. Sharpening (create 2 duplicate layers and sharpen each layer) [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% 5. Adjustments [Layer -> New Adjustment Layer -> Levels] Note: change midtone to 0.97 [Layer -> New Adjustment Layer -> Hue/Saturation] Note: change saturation to +8 6. Save JPG file [File -> Save As] Note: Select Folder + Type Filename + Save As Type = JPEG, and set Quality = 12 Bridgewater Photographic Society 2016/17 23
How to Resize using Photoshop Step 3 Bridgewater Photographic Society 2016/17 24
How to Resize using Photoshop Step 4 Set Opacity to 70% After Resize Bridgewater Photographic Society 2016/17 25
How to Resize using Photoshop Step 5 Bridgewater Photographic Society 2016/17 26
How to Resize using Photoshop Step 5 continued Bridgewater Photographic Society 2016/17 27
How to Resize using Photoshop Step 6 PO1_Can I Play Too_Trevor Awalt JPG Quality = 98% dpi = as chosen from the export dialogue Bridgewater Photographic Society 2016/17 28
Final Checks! Check The File Size and Name Bridgewater Photographic Society 2016/17 29
Final Checks! Check The Pixel Size Bridgewater Photographic Society 2016/17 30