? ? Resizing and Naming Photos for Competition and Naming Photos for Competition Version 2.0? ?? ?...

Bridgewater Photographic Society 2017/18 1

Resizingand

Naming Photos for

Competition

Version 2.0

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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|1920], and the pixel height [768|1080] 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.

What is the Ratio?1024/768 = 1.333 [4:3]

1920/1080 = 1.778 [16:9]

Let’s start with some Theory

1920x1080

1920

1080


How small is my image?

1920x1080 = 2.073Mpix [ 6.4”x3.6” @300dpi ]

1024 x 768 = 0.786Mpix [ 3.41”x2.56” @300dpi ] 1024 x 684 = 0.700Mpix [ 3.41”x2.28” @300dpi ]

Ratio4:3

Ratio3:2

Ratio16:9


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?

SensorFull FrameFull FrameFull Frame

APS-CAPS-CAPS-C

Micro Four Thirds

1.5 Inch

1/3 inch

Physical Size36.0mm x 24.0mm36.0mm x 24.0mm35.9mm x 24.0mm

23.5mm x 15.7mm22.3mm x 14.9mm23.5mm x 15.6mm

17.3mm x 13.0mm

18.7mm x 12.5mm

4.89mm x 3.67mm

Ratio3:2 [1.5]3:23:2

3:23:23:2

4:3 [1.333]

3:2

4:3

Mega Pixels30.4 (6720 x 4480)21 (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)

CameraCanon 5D MKIVCanon 5D MKIINikon D750

Nikon D500Canon 7DNikon D5500

Olympus OM-D E-M1

Canon G1X MKII

iPhone 6Plus

Canon 5D MKII -> 5616 x 3744 = 21.026 Mpix[ 5616 / 3744 = 1.5 ]

How to Calc the Mega Pixels? How to Check the Ratio?

Canon 5D MKII -> 5616 / 3 = 1872pixx2

3744pix


Image Resolution

0.922Mpix

2.074Mpix

17.916Mpix

21.026Mpix

15.176Mpix

17.741Mpix

4K iMac 4096 x 2304

8.294Mpix

9.437Mpix


123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566

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 pixels0.006534 Mpix

Ratio 3:2

An Example of a arbitrary sensor


Q2: How can I figure out the Ratio?

x/y1.01.51.3331.251.41.2731.778

Ratio1:13:24:35:47:514:1116:9

Example Print SizesSquare, 10x10, 12x12, 16x164x6, 8x12, 12x18, 16x24, 20x30, 24x3612x16, 18x24, 24x32, 30x404x5, 8x10, 16x205x7, 20x2811x1416x9

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


Example using our Projector: 1024 / 768 = 1.333


width:height


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

768683


Q3: If the projector has a maximum capability to display 1920 x 1080, am I forced to crop my image to a 16:9 ratio?

A3: No. The 1920 pix horizontal and 1080 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 1620 pix x 1080 pix. With 84% of the horizontal pixels used, the image still displays ok.

Unused Pixels

1920

1080

1620


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


Q4: How does the projector display a “Portrait” orientated image?

A4: As an example: if the “Portrait” orientated image was a 4:5 ratio, the maximum pixel limitation is the vertical 1080 pixels. Your resulting 4:5 ratio image would end up being 864 pix wide x 1080 pix high. The result is only 45% of the horizontal pixels being used.

Always check your math:(PXw/width) x heigh t= PYh(1920/4)x5=2400 high

(PYh/height) x width = PXw(1080/4)x5=1350 wide

Unused Pixels

1920

1080

864width

hei

ght


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.


Q5a: What if I cropped an original image, because I do not have a macro lens, and the resulting image size is smaller than 1920x1080?

A5a: This was not a concern when the projector size was 1024x768, normally reducing the original size of your photo. Now that the projector size is much bigger enlarging your photo maybe necessary. This can, in some cases, create very poor results which is typically not recommended especially if you are trying to go more than 2x the original size of the image.Because images are pixel based the software has to interpolate and add new or expand the pixels in the image. Pixels are square and not round as a result the edges may no longer appear smooth.Recommended software would be On1 resize (uses complex fractal math), or Photoshop.


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 original.




If you are viewing a photo that is 1620pix x 1080pix on a computer display that has a resolution, for example, of 1920pix x 1080pix, the photo will take up 100% of the screen, it’s still not recommended to zoom in beyond that point.

If you zoom in further than 1920 x 1080, the software uses an algorithm to enlarge the photo and the resulting photo on the display will not be a true representation of the original.




If you are viewing a photo that is 1620pix x 1080pix on a computer display that has a resolution, for example, on a 21” 4K iMac of 4096pix x 2304pix , the photo will not take up 100% of the screen. Even though it is considerably better than a 1024x768 image it’s still not recommended to zoom in beyond 100%.

We can see how the image is viewed digitally is important in relation to viewing at 100%

1620x1080 [ 3:2 ]

1024x768 [ 4:3 ]

Shown at ½ actual display size of 18.7” x 10.52”@219ppi, which does not fit on my slide

9.35”

5.26”

4096x2304 [ 16:9 ]


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*Long Edge + 1024px(1024/3)x2=683pxPhoto size = 1024x683pxMetadata:1024/300=3.41” wide683/300=2.28” high

Assume the ratio is 3:2*Long Edge + 3.413”3.413x300=1024px(3.413/3)x2x300=683pxPhoto size = 1024x683pxMetadata:3.41” wide(3.41/3)x2=2.28” high

Assume the ratio is 3:2*Short Edge + 1080px(1080/2)x3=1620pxPhoto size = 1620x1080pxMetadata:1620/300=5.4” wide1080/300=3.6” high

Short Edge

1080

Assume the ratio is 3:2*Short Edge+3.6”3.6x300=1080px(3.6/2)x3x300=1620pxPhoto size = 1620x1080pxMetadata:5.4” wide(5.4/3)x2=3.6” high

Short Edge

3.6”


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.

3438ppi (px 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 ppivd = 3438/141.57 = 24.28 inches

Check the rule [15.5x1.5]:3438/23.25”= 147.87 ppiCheck the rule [15.5x2]:3428/31”= 110.58 ppi

In summary a viewing distance of approximately 2 feet (24”) is recommended!


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 ppivd = 3438/21.33 = 161.18 inches (13.43ft)

Check the rule [60x1.5]:3438/90”= 38.2 ppiCheck the rule [60x2]:3428/120”= 28.6 ppi

Viewing distance should be:ppi = 1920/48 = 40 ppivd = 3438/40 = 85.95 inches (7.16ft)

Check the rule [55x1.5]:3438/82.5”= 41.52 ppiCheck the rule [55x2]:3428/110”= 31.16 ppi

55”16:9

48”

27”

Resolution = 1920px X 1080px = 2.073 Mpix

48^2 + 27^2 = 55”


How to Name Photos for Competition

Deadline for Field Trip Photos. Send your 8 (maximum) images to [email protected]. 1024x768 jpegs, named FT1_Image Title_FirstnameLastname ... FT8_Image Title_Firstname Lastname.

Example of an email message you will receive from [email protected]:

1st important part to extract from this message is how to name your photo and the 2nd part is the size restriction.

FT1_Image Title_Firstname Last Name

FT1_Blue Jay Ballet_Trevor Awalt.jpg

This presentation shows you where to rename your photos within the resizing examples in the following slides.

Deadline for Field Trip Photos. Send your 8 (maximum) images to [email protected]. 1920x1080 jpegs, named FT1_Image Title_FirstnameLastname ... FT8_Image Title_Firstname Lastname.

Naming your Photos

mailto:[email protected]

mailto:[email protected]


Examples included of software titles for Processing and Resizing Photos

Lightroom CC – AdobePicasa – GoogleOn1 Photo 10 – On 1 IncIrfanView – FreewarePhotoshop CC – Adobe

Note: the software below is not a complete list of all titles available

Photoshop Elements – AdobeOn1 Photo RawAperture – Apple (no longer supported)Paintshop Pro – CorelAftershot Pro – CorelCapture One Pro – PhaseOneLuminar – MacphunGimp – Freeware

Examples of other software titles for Processing and Resizing Photos

SoftwareAll Examples are Shown Using Windows


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

Short Edge

1080

[ 3:2 ] Ratio


How to Resize using Picasa (File -> Export Picture To Folder)

JPG Quality = 93%dpi = retains orig

1620

Automatic

JPG Quality = 98%dpi = retains orig

(Width)


Don’t forget to Change The Name with Picasa!

NA1_Where Is My Lunch_Trevor Awalt


How to Resize using On1 Photo 10 (File -> Export)


Short Edge

1080


How to Resize using IrfanView (Image -> Resize/Resample)



Don’t forget to do a “Save As” with IrfanView!


How to Resize using Photoshop CC 2017 (File -> Export -> Save for Web)

JPG Quality = 98%dpi = 96


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 CC 2017 (File -> Export -> Save for Web)


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


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: (1920/10)x8=1536 result greater than 1080. Instead calc based on shortest edge: (1080/8)x10=1350 result will work ie. <= 1920. Now calc 1.67 times: 1080x1.67=1804 result the interim size will be 1804x2255 [(1804/8)x10)=2255.

[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


How to Resize using Photoshop Step 3

Width=2255Height=1804



Set Opacity to 70% After Resize

Width=1350Height=1080


How to Resize using Photoshop Step 5 continued




PO1_Can I Play Too_Trevor Awalt


Final Checks!

CheckTheFileSizeand

Name


Final Checks!

CheckThePixelSize

4:3 ratioWidth=1440Height=1080

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