I'm using multer node and express to upload a image to my app. But some images shows rotate 90 degrees when it's on the client.
why is this happening?, how can I fix it?
By the way I'm using vue on the client and for the upload process, of course I use formdata
UPDATE
After research and comments from the guys above, its a EXIF problem. Any code ideas to solve this?
The behaviour you are experiencing is probably caused by the Exif Orientation metadata.
There is another question here on Stackoverflow about this problem: JS Client-Side Exif Orientation: Rotate and Mirror JPEG Images
The selected answer points to a project called Javascript-Load-Image as a possible solution, that basically means you will have to take the orientation in consideration when rendering the images to get a consistent behaviour.
Another possible alternative would be to edit/remove the orientation metadata in your backend.
Check the following resource for more information:
JPEG Image Orientation and Exif
This is most likely caused by Exif metadata (just like #Romulo suggested).
Browsers ignore Exif metadata when displaying images and that's why you're getting this behaviour.
To check that this is related to Exif take 4 pictures with different phone orientation (landscape left, landscape right, portrait, upside down). One of them will be shown properly, while the other 3 will be rotated. (Also note that if you're using the front camera, the image will also get mirrored).
Not all camera phones do this, but iOS does it consistently. The reason for this is performance. When rotation the phone the sensor also rotates and the picture taken doesn't take the rotation into consideration.
To properly show the photo, the image needs to be rotated, but if you just change the Exif metadata then you don't need to do it. Of course, any client that shows the image needs to be aware of this information (and iOS Photos and such are aware).
This has nothing to do with multer, but with the images are stored.
The bottom line is that you need to rotate the image to compensate for this.
Take a look over this npm package to adjust your image on the server side.
Related
I feel like I have been stuck perpetually with this problem. I have a single geoTIF file of weather radar data that will not overlay on Mapbox correctly. The spatial area is of the entire US. It should be a simple task, but there seems to be some sort of weird distortion causing the overlay to not be correct, even though I am very certain my Mapbox coordinates in the linked HTML file below are correct and match the geoTIF.
I uploaded the geoTIF to a website called "geotiff.io" (which uses leaflet to show the files) and it renders the image perfectly, but I cannot emulate it using Mapbox. The storms always are off in Mapbox.
This is a link to my Mapbox map with the image overlay where it is incorrect
This is a dropbox link to a zip file with the geoTIF and colorization file, which I used gdaldem with
I would like to explain more, so it's simplified. Here is an image showing part of a storm that is out of place (left side) and how it is too far north. On the right side was a screenshot taken from geotiff.io - and how it's perfect. What is going on here?!
The geoTIF image was not set as a web mercator projection before being displayed in Mapbox. I assume the geotiff.io service corrected this automatically and made me think there was an issue with the code or Mapbox, when it was not.
I have been trying to implement a feed App like Instagram or Facebook. ImageViews have match_parent width (screen width) and wrap_content height.
The code I have used...
Glide.with(context)
.load(imageURL)
.thumbnail(0.1f)
.diskCacheStrategy(DiskCacheStrategy.ALL)
.into(imageView)
;
That results into loading thumbnail first. The thumbnail is very small in size. I was expected that the thumbnail will display a faded image with the original image height.
Without thumbnail, the ImageViews do not populate any image (when loading) and then suddenly the original images comes into picture. I cannot use any place holder image as the height of the place holder image may not match the actual image to be loaded, makes it a bad user experience.
I have also tried...
Glide.with(context)
.load(imageURL)
.diskCacheStrategy(DiskCacheStrategy.ALL)
.placeholder(null)
.into(imageView)
;
But it is not working! I was wondering how the Instagram App does those fade in loading with images (with original image height)?
I have looked into various websites including the Glide Github issues and stack overflow, but unable to find any solution! I have already wasted about 6 hours of my day. What is the way out of this problem?
Use override attribute:
Glide.with(context)
.load(imageURL)
.override(18,18)
.thumbnail(0.1f)
.diskCacheStrategy(DiskCacheStrategy.ALL)
.into(imageView);
Also as Instagram is owned by Facebook it might be the case that they use Fresco library (not sure though).
Is there some plugin/way to crop images when they are uploaded in a Modx TV?
I got a slider with a ratio of 1:4. Now when the user uploads a image in another ratio, the image will stretch out.
I want something like Facebook does when you upload a cover image which is to high.
(PS: I want to use it later in Migx)
Like 'okyanet' mentioned you can use phpThumbOf to set the dimensions/ratio when MODx delivers the image.
Another way would be to use the extra 'Image+'. You still need phpThumbOf for this, but the Editor can define the clipping manually in the Manager. And you can define the ratio of the clipping in the TV-Setting for the image.
Use phpThumbOf. The 'zoom-crop' parameter will allow you to preserve the source aspect ratio and then crop it to the dimensions you require.
The image is processed when the page is parsed by MODX, rather than at the time of upload.
There are plenty of articles about how to use this extra, including this one:
http://www.belafontecode.com/image-manipulation-with-phpthumbof-in-modx-revolution/
I have developed an LWUIT app. I have two types of images dispayed in the app. One coming from server side that need to displayed (like a photo posted and saved to server side) and one packaged in my jar and displayed mainly as icons (like a music icon, loading animation gif etc). I need to display all images according to the sreen size and resolution. The first kind is displayed by taking the screen display height and width and then use scale method and show a scaled version of the image. But however I have no idea how to show the second kind. i.e. icons. Example, my loading image looks good in most of the phones but for some phones like samsung, it looks blurred and over-sized. How to do this. My basic idea is to keep 3 types of images of icons like icon_width_lowXheight_low.png, icon_width_mediumXheight_medium.png and image_width_highXheight_high.png and show it based on the screen size. Please let me know the bets way to achieve this?
Thanks,
Parvathy
You should use MultiImages which were added in LWUIT 1.5. I don't have a link for this in LWUIT but our work in Codename One is pretty close to this so check out the How Do I? on multi images (and I suggest migration to Codename One regardless).
I think that you will need to use this
Image i = Image.createImage("your image path here");
i = i.scaled(widthValue, heightValue);
And put this values in relation to the Display.getInstance().getDisplayHeight() and Display.getInstance().getDisplayWidth()
Right?
I am new to developing on the iPhone so am sorry if this is an easy question, but it has had me stumped for a little while.
Basically the app displays data retrieved from an XML feed. In that feed is an element that contains the path to an image. eg http://www.myserver.com/myimage.jpeg.
I want to be able to display that image in the list view of my iPhone app.
Most importantly, I don't want to stop the list drawing for each image, the rest of the data should be displayed immediately and then each image downloads and displays as quickly as data speed etc make it available.
What is the best way of downloading that image and displaying it?
Ideally can someone point to some working example code.
Thanks
Stephen
Displaying the image: you could create a UIWebView and just point it to the path - and then it's fully zoomable too.
Displaying in the list view:
//Somehow download your image...
cell.image = Your Image