How Cloudinary eases Responsive Web Design, and more
A presentation at Cloudinary's Customers Dinner in in London, UK by Nicolas Hoizey
How Cloudinary eases Responsive Web Design …and more Nicolas Hoizey London, October 18th
Hello, I’m Nicolas Hoizey Co
founder and CTO of France (6 Agencies ) Canada Switzerland Hong Kong Singapore a full
service agency covering the entire digital production chain
Hello, I’m Nicolas Hoizey Co
founder and CTO of Clever Age Web projects facilitator RWD and WPO expert Amateur photographer
Let’s talk about Responsive Images
Responsive Images are fluid …
The HTML: < img src
" image.jpg "
The CSS: img { max
width : 100% ; height : auto ; } !
The HTML: < img src
" really
huge
image.jpg "
The CSS: img { max
width : 100% ; height : auto ; } "
You must send different images to each device
Most of the time, you only need several sizes of the same image
Here comes the new responsive images standard!
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The HTML: < img src
" fallback.jpg " srcset
" small.jpg 320w, medium.jpg 800w, large.jpg 1200w, extra
large.jpg 1600w"
Viewport width: 360px Screen density: 3 Ideal image width = viewport * density = 360 * 3
1080px Available images: 320, 800, 1200 , 1600 !
Viewport width: 2560 px Screen density: 2 Ideal width = 2560 * 2 = 5120px "
Viewport width: 1200 px Screen density: 2 Ideal width = 1200 * 2 = 2400px
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The HTML: < img src
" fallback.jpg " srcset
" small.jpg 320w, medium.jpg 800w, large.jpg 1200w" sizes
"(max
width : 480px) 100vw, (max
width : 800px) 50vw, 33vw"
Viewport = 1200px CSS size = 33vw ≈
400px Viewport width: 1200 px Screen density: 2 Beau Soleil Bann er Lorem ipsum dolor sit amet, consectetur adipiscing elit. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Me n u Me n u Me n u Me n u Me n u Beau Soleil Banner Lorem ipsum dolor sit amet, consectet adipiscing elit. Lorem ipsum dolor sit amet, consectet adipiscing elit. Lorem ipsum dolor sit amet, consectet adipiscing elit. Lorem ipsum dolor sit amet, consectet adipiscing elit. Menu Menu Menu Menu Menu BS Bann er Lor em ipsum dol or sit am et , consectetur adipiscing el i t . Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Ideal image width = CSS size * density = 400 * 2
800px Available images: 320, 800 , 1200 ! Viewport width: 1200 px Screen density: 2
Most of the time, it will be enough !
But how do we get all these images on the server?
Option #1: Do it yourself
You upload the master on your server
Server computes and stores all sizes Master 320 800 1200
Browsers ask the server for specific sizes of the image 320 1200
You need :
the master image
an image processor
computing power
storage capacity
bandwidth
Option #2:
Upload the master on Cloudinary
Or just ask Cloudinary to fetch it
Cloudinary creates on the fly the sizes the browsers ask for 320 1200
Your image name: master.jpg The final image URL: / <transformations> / master.jpg
Cloudinary URL API access point = https:// res.cloudinary.com /< account
/image/ upload /
Your image name: master.jpg The final image URL: / w_320 / master.jpg creates a 320px wide image, keeping the aspect ratio
The new HTML: < img src
"
/w_600/
master.jpg
”
sizes
"…" srcset
" / w_320 / master.jpg 320w, / w_800 / master.jpg 800w, / w_1200 / master.jpg 1200w"
$
You need :
the master image
a Cloudinary account
no local image processing
less computing power
less storage capacity
less bandwidth
But sometimes , you need Art Direction
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The HTML: < picture
< source media
" ( min
width: 800px ) " srcset
"
/w_320/
portrait
.jpg
320w,
/w_800/
portrait
.jpg
800w,
/w_1200/
portrait
.jpg
1200w"
sizes
"… "
< img src
"
/w_600/
landscape
.jpg"
srcset
"
/w_320/
landscape.jpg
320w,
/w_800/
landscape
.jpg
800w,
/w_1200/
landscape
.jpg
1200w
"
sizes
"…"
</ picture
You probably don’t want to upload two masters every time
Automate with Cloudinary /w_320/ portrait.jpg / c_fill ,w_320,h_450/…
Automate with Cloudinary % /w_320/ portrait.jpg / c_fill ,w_320,h_450/ landscape.jpg
Much better , still with Cloudinary /w_320/ portrait.jpg / c_fill ,w_320,h_450, g_face / landscape.jpg
Much better , still with Cloudinary /w_320/ portrait.jpg / c_fill ,w_320,h_450, g_face / landscape.jpg $
You also want to optimize performance
Send the lighter image format image.JPEG : 96KB image.WebP : 27KB Firefox Chrome
The HTML: < picture
< source type
" image/ webp " srcset
" small .webp 320w, medium .webp 800w, large .webp 1200w " sizes
"…"
< img src
" fallback.jpg " srcset
" small.jpg 320w, medium.jpg 800w, large.jpg 1200w " sizes
"…"
</ picture
The original JPEG image URL: /w_320/ master.jpg The WebP image URL: / w_320 ,f_webp / master.jpg The image is now WebP
Or…
The original JPEG image URL: /w_320/ master.jpg The better image URL: /w_320 ,f_auto / master.jpg The image is now in the best ( lighter ) format for the browser!
The HTML: < img src
"
/
w_600,f_auto/
master.jpg
"
sizes
"…" srcset
" / w_320,f_auto / master.jpg 320w, / w_800,f_auto / master.jpg 800w, / w_1200,f_auto / master.jpg 1200w"
$
Using Cloudinary with
Jekyll is one of the oldest and most popular static site generators . It takes content written in Markdown format, and uses Liquid templates to generate HTML pages.
Default
way to add an image:
Generates standard image HTML:
<
img
src
" image.jpg " alt
"alternative text"
https:// nhoizey.github.io / jekyll
cloudinary /
An image with the jekyll
cloudinary plugin: {% cloudinary <preset> image.jpg alt="…" %} Generates responsive image HTML with < img
and srcset . You just have to define presets for:
The minimum and maximum widths
The number of sizes to generate
The layout with the sizes attribute
One last thing …
Cloudinary is not limited to responsive images It also allows multiple image manipulations. I use it to generate my opengraph images, for better sharing on social networks.
This post
Automatically gets this opengraph image
And here’s the post in Facebook
Here’s the URL: https:// res.cloudinary.com / nho /image/ fetch /e_blur:2000, c_crop,ar_1200:630,b_white/ e_grayscale /w_1200/ l_fetch:a HR0cHM6Ly9uaWNvbGFzLWhvaXpleS5jb20vYXNzZXRzL2xvZ29zL2Ns b3VkaW5hcnkucG5n,h_1.0,w_1.0,fl_relative,c_limit/ b_rgb : 3d2e68,o_50/w_1120,c_fit,l_text:georgia_80:Cloudinary%2 0fait%20la%20promotion%20de%20mon%20plugin%20Jekyll,g_n orth_west,x_41,y_42,co_black,o_90/w_1120,c_fit,l_text:g eorgia_80:Cloudinary%20fait%20la%20promotion%20de%20mon %20plugin%20Jekyll,g_north_west,x_40,y_40,co_white/ l_te xt:georgia_50:nicolas
hoizey.com,g_south_east,x_40,y_40 , co_black /l_text:georgia_50:nicolas
hoizey.com,g_south_ east,x_41,y_41,co_white/https :// nicolas
hoizey.com /asse ts /logos/ cloudinary.png &
Thanks for your attention! nhoizey@clever
age.com @ nhoizey ✉
Thoughts on Responsive Images, the Cloudinary plugin for Jekyll, and more!
From the registration page: "Please join us for a fabulous networking dinner and drinks! You will also get a chance to hear from Nicolas Hoizey web facilitator extraordinaire, Amit Sharon VP Customer Success and a shared use case from one of our very own Cloudinary customers!"
Resources
The following resources were mentioned during the presentation or are useful additional information.
-
jekyll-cloudinary
jekyll-cloudinary is a Jekyll plugin adding a Liquid tag to ease the use of Cloudinary for responsive images in your Markdown/Kramdown posts.
Buzz and feedback
Here’s what was said about this presentation on social media.
