On some occassion, Google Chrome download a line (of maybe 20px) at a time and display it right away. So the picture is rendered from top to bottom. Using html tag results in this.
On other occasion, Google Chrome displays a picture from facebook photos in an interleaving way, first a bit grainy, and then it becomes clearer as more data has been downloaded.
This way the picture is displayed wholly at first with low resolution and the resolution is getting higher as if it's being streamed.
Is there a special tag to do this "streaming" ?
The correct word is "interlace" - when you save the image in some web formats (.jpeg for example), you often have the option to save it interlaced - I know this option exists in Photoshop's "Save for Web".
So it's not an html tag - it's the way the image is encoded. And then the browser has to be capable of "streaming" interlaced images (most modern ones are).
Hope this helps
Related
I created a Collection View for a app that showing photo specific by self app captured.
When showing the original photo it very slow e.g. the size of 5MB~10MB may be too large for showing.
Is there any way that I can get or even create the thumbnail for preview?
I tried for using C# standard way but the Image.Save( MemoryStream in MAUI is Windows platform only ...
First of all, I want to point out, that it is not a matter of choice.
Too big images will not be rendered, and you will see nothing but white space. (Learned that from testing it on Android.)
You can check this first:
https://learn.microsoft.com/en-us/dotnet/maui/user-interface/graphics/images?view=net-maui-7.0
I also use ImageSharp. (Despite the non-sense that happened recently, this is still a very good tool).
In any case, maybe it will be good to store the photo and the thumbnail separately, speaking of collection view, I do not think that it will perform well, if you need to mass-scale 5-10 MB photos. At least the devices I use cannot do this effectively.
Are there any web tricks to speed up the loading of a web page. I have a few pages where I have images which were created in photoshop, but they are saved as a PNG. The load time is fairly slow of the page due to this, is there anyway to speed up a page load? They are in the region of 1.2/1.5MB
Reducing the size of the file would be a significant advantage.
Additionally converting the asset to webp for Chrome and Firefox, jp2 for Safari and falling back to png would help retain quality while reducing file size.
If the image isn’t in the first viewport you can also try lazy loading the image with something like lazysizes or at the very least the loading attribute.
You could compress the images using an online tool. Although, this may slightly reduce the quality.
I’ve used this site before: https://tinypng.com/
Other than that, I’m not sure if you can “speed up” the load time for a webpage.
You can check your website images here
https://www.imghaste.com/pagespeed/
1.2 to 1.5MB for each image is way large.
You need to adopt a process where you can optimize/shrink images for your website.
If you don't really need the images to be PNG you can always convert them to JPEG.
https://www.imghaste.com/converter
I am using the facebook plugin on my wordpress website. My posts are image-only. I am able get the open graph functionality to work, however the image is either a tiny thumbnail with a useless excerpt box beside it, or full-sized with half of it cut of because of the useless caption box.
Now, I say useless, but I wouldn't mind having only my url presented below the image if possible, but without all the extra space. It looks terrible. Also, My image posts do not have titles so in the excerpts box the only title option without a separator for the "collection" theme I am using is sitenameonly....which leave my
sitename
site url
< .........huge extra excerpt space..............................................................................................................................................................................................................................................................................................................................................................>
I have looked elsewhere, in fact all over but can't find information to:
make images full-sized (as if they were posted directly to facebook)
Remove extra space in the excerpt box, leaving only the url
(or remove the box entirely--leaving a full-sized image)
thanks so much in advance
As long as your Wordpress plugin assigns a proper image to each post using the og:image tag and the conditions stated below (emphasis added) then you should be able to get full size posts.
We've increased the size of images in link page posts by 4x on mobile
and 8x on desktop to help you drive better fan engagement. As part of
this change, we've also made the aspect ratios for images consistent
across mobile and desktop. We recommend the following steps to
optimize your images for this new format:
Use images that are 1200 x 630px or greater for the best display on high-resolution devices. At the minimum you should use images that are
600 x 315px to display link page posts with larger images.
Use images that have an aspect ratio of 1.91:1. Try to keep your images as close to this aspect ratio as possible to avoid any cropping
in News Feed.
Use the og:image tag to choose the image that you want to share. If you don't use the og:image tag, users can choose the image they want
to post, giving them a chance to select an image that is poor quality.
Source: Larger Images for Link Page Posts
I've seen a lot of apps that when you click photos you get a small square of each image, and then when you click them you get a full screen version. Actually, just like the photoreel.
Is there a way of populating the photoreel with an array of images? I have about 6 per location that I'd like to show like that.
I've had a google, but coming up a bit blank!
Any help would be appreciated
This is a Flikr JSON tutorial (the first part is mostly the JSON calls but they do some early GUI set up too) but it gets a preview of each image in a small thumbnail and then when clicked it opens the full image in the same window.
Depending on how your images are loaded simply replace the json creation with your array/dictionary params and follow how the tutorial progresses, its only 3 parts and has a good starting point for what you're looking for.
Hope it helps
We're using the facebook graph API http://developers.facebook.com/docs/reference/api/post/ and adding the picture parameter. Our picture is a 30x30 pixel image, which is exactly the size we want for the facebook web version. However, the image will be pixelated when using the FB mobile app on an iPhone4 (retina display).
Is there any way to serve a 60x60 high resolution image, but render it always at 30x30 for facebook wall posts?
Well.. as of this moment, here is what I have found out, and offer a 'solution' that has worked for me based on the time i've had to test & play with this concept. For all the readers out there, who need a quick answer to the question, i don't have the exact solution to the question, but…. Essentially, your 30x30 image is being scaled to 90x90. The 60x60 image is being scaled to 90x90. And I can not find a way to go around this.
Below is what I have tried. Feel free to add input.
Take your feed image, and stroke a 2-5px black line around the frame of the image.
Load up your app, initiate a wall feed on the device. With the image present, take a screenshot. Mail yourself the image. Open it up in Photoshop (or photo editing program). Use a Marquee tool to outline the image. Cut it out of the screenshot and paste it as a new image. What size is it? 90x90, right? (and obviously 180x180 if image is retina)
Create a 90x 90 image. Copy your original 30x30 image and paste it anywhere you want within the new 90x90 images' frame. Upload it to the URL parameter's location. Re-run your app. By re-running it, i mean you have to shut it down completely, it appears as though the SDK is cacheing the image upon first launch of the feed and you can clear that cache by closing the app completely, and rerunning it. When you do, you will see significant improvements with the look of the image. It may not be a retina image, but it at least won't be 'fuzzy ugly'. At this point, it boils down to how nice of illustrative lines that where done in the design process to remove the aliasing effect produced from the conversion to a raster graphic. As well, i'm not sure if a variation of resampling method will produce even better results.
Some things i've tried:
I've also saved it as a png file with no transparency : 144ppi at 90 x 90 size. In other words, save your 90x90 image with a higher resolution (pixels per inch). Remember to not constrain proportions as you image resize. And note that If you are using adobe products, i.e. photoshop ) - don't save for web, just use 'save as…', as this will retain the ppi you specified. Although, i don't believe i see much of a difference in the quality which this is displayed going this route, and best to try to keep the file size down as this will increase the overall image size by about 500% or more.
I've tried variations of hosting the image twice the size (180x180) within the same hosted folder and naming it image#2x.png & image-large.png <--(just for the heck of it). This is not really solving the problem either.
Some other things I have not tried:
Monitoring your web server traffic, and any "not found" errors to a resource to see if FB is trying to access an a potential alternate resource when grabbing your image for display, the wall feed box that comes up is a webview. Meaning web graphics. (It's FB's web page…meaning their rules, and i doubt the pages' source is available to dabble with within the SDK.. so!…
Look at the HTML of the feed itself with safari browser:
The inspection of the HTML within the final resulting image that is posted on my FB wall I can see this….
<img class="img" src="http://platform.ak.fbcdn.net/www/app_full_proxy.php?app=153675474666495&v=1&size=z&cksum=773bba91f6146b2463eed0a0bb77dc42&src=http%3A%2F%2Fwww.thumbwizards.com%2Fspeakinapps%2Fgraphics%2Fboxed%2Faussie.png" alt="">
I am wondering:
Within HTML5 isn't there a mechanism to provide a toolkit type of javascript to display retina graphics from a web page?
Would it be possible to have that code run when grabbing the url to the image (in meaning, the url of the image would be acting as a pointer to the code.? I haven't tried playing with this, since my logic tells me that per the url above that FB is essentially taking control over the image at this point. I have noticed (and not waited long enough to see) that the image is apparently cached and posting to the wall with a new image, sometimes results in the older image still being used. (and yes, i've cleared my browser cache)… perhaps simply cached in another location..
If there is another parameter for the image type, that is not published, I have not stumbled across any yet.
Can anyone figure out if through source of:
[http://platform.ak.fbcdn.net/www/app_full_proxy.php] if this php file is part of an available image processor out there we can access to view what could be done?
Can anyone mention an app that uses a retina graphic in their feed post?
Just thoughts really, I've decided to not really give a crop, and if
you've made it this far. Thanks for tuning in. ..So, Sulf, your 30x30 is being scaled to 90x90. making it UGLY!.
Good luck.. If you figure anything else out, let me know!
Mark
apple specify that if you want to add the retina effect for your ios app then the images you are using in this format -i.e
sampleImag.png- 57*57(size) , 163 (DPI)
sampleImag#2x.png - 114*114(size),326 (DPI) when you use these specific graphic images you will get your app is showing retina effect in iphone 4 and above generation.
Just point your code to a larger scaled image and Facebook will take care of the rest.