The jpg images saved to Photos on iOS are not the original images from the server.

[ngtrio]

The bug

I have noticed that the JPG images downloaded from the server in the iOS app slightly vary in size (they look the same visually), which results in duplicate images on the server
The PNG images are not affected.

The OS that Immich Server is running on

unraid 6.12.6

Version of Immich Server

1.101.0

Version of Immich Mobile App

1.101.0

IOS 17.4.1

Platform with the issue

• Server
• Web
• Mobile

Your docker-compose.yml content

I don't feel like this is particularity relevant but I can provide if needed

Your .env content

I don't feel like this is particularity relevant but I can provide if needed

Reproduction steps

1.upload a JPG image to server via web page
2.click the download cloud-shaped button in the iOS app
3.you will see an extra image in the gallery that looks identical visually, and the cloud-shaped download button has not been checked as expected.
4.comparing the downloaded image with the original uploaded image will reveal that they are of different sizes.

Relevant log output

No response

Additional information

No response

[mmomjian]

Can you be more specific with the filesize? How are you determining this size and what changes are you seeing?

I believe the backup symbol is supposed to indicate images that were backed up from that device, which the downloaded one was not, since it was uploaded on Web.

[waclaw66]

This happens (#6209) when you upload file with the same filename but different content than you have downloaded to device.
Seems the file is moddified during transfer to device. Please compare it binary.

[ngtrio]

@mmomjian I exported two images, and renamed them to "upload" and "download" for convenience.
The uploaded one is 100842 bytes, and the downloaded one is 101518 bytes. Moreover, this change occurs only between the steps of uploading from the web and downloading from the app.

I think the change in file size causes the hash of the two images to differ, so duplicate images exist on the server.

BTW, I am unable to reproduce this issue with PNG images. When I download the image from the app, the backup button is correctly checked and there is only one image, even if the image was uploaded from the web.

So, is anyone else able to reproduce this issue with JPG images, or is it a configuration issue on my end?

[ngtrio]

This happens (#6209) when you upload file with the same filename but different content than you have downloaded to device. Seems the file is moddified during transfer to device. Please compare it binary.

It doesn't appear to be the same issue, as I haven't performed any editing operations on the images.

[waclaw66]

I think the change in file size causes the hash of the two images to differ, so duplicate images exist on the server.

Binary comparison of those two would help to track the cause of file size change. It could be many reasons, reverse proxy missconfiguration, unintentional modification some app on your phone, etc.

[ngtrio]

I have tried the following steps again with the help of a few friends:

1. Upload the 693-byte JPG image below to the immich server.
   .
2. Save this image from the immich iOS app.
3. Save this image from the ios "Share".

Now I have the following three images, corresponding to the three steps above by name:
.
As you can see, the sizes of the last two images are the same(16983 bytes), both larger than the original image(693 bytes).

Then I used exiftool to compare the three images, the latter two are consistent and both contain more information than the original image, especially this one: Thumbnail Image : (Binary data 16004 bytes, use -b option to extract):

Therefore, I speculate that the way immich's iOS app saves images may be similar to the way images are saved in the iOS Share, which adds some additional data to the original image, rather than using the system API to save original images (if there is one). Could iOS developers please help confirm this?

• origin-image

ExifTool Version Number         : 12.76
File Name                       : origin-image.jpg
Directory                       : .
File Size                       : 693 bytes
File Modification Date/Time     : 2024:04:17 11:19:08+08:00
File Access Date/Time           : 2024:04:17 11:24:55+08:00
File Inode Change Date/Time     : 2024:04:17 11:24:54+08:00
File Permissions                : -rw-r--r--
File Type                       : JPEG
File Type Extension             : jpg
MIME Type                       : image/jpeg
JFIF Version                    : 1.01
Resolution Unit                 : None
X Resolution                    : 1
Y Resolution                    : 1
Image Width                     : 256
Image Height                    : 213
Encoding Process                : Progressive DCT, Huffman coding
Bits Per Sample                 : 8
Color Components                : 3
Y Cb Cr Sub Sampling            : YCbCr4:2:0 (2 2)
Image Size                      : 256x213
Megapixels                      : 0.055

• save-from-immich-app

ExifTool Version Number         : 12.76
File Name                       : save-from-immich-app.JPG
Directory                       : .
File Size                       : 17 kB
File Modification Date/Time     : 2024:04:17 11:22:50+08:00
File Access Date/Time           : 2024:04:17 11:24:51+08:00
File Inode Change Date/Time     : 2024:04:17 11:24:49+08:00
File Permissions                : -rw-r--r--
File Type                       : JPEG
File Type Extension             : jpg
MIME Type                       : image/jpeg
JFIF Version                    : 1.01
Exif Byte Order                 : Big-endian (Motorola, MM)
X Resolution                    : 72
Y Resolution                    : 72
Resolution Unit                 : inches
Y Cb Cr Positioning             : Centered
Exif Version                    : 0221
Components Configuration        : Y, Cb, Cr, -
Flashpix Version                : 0100
Color Space                     : sRGB
Exif Image Width                : 256
Exif Image Height               : 213
Scene Capture Type              : Standard
Compression                     : JPEG (old-style)
Thumbnail Offset                : 304
Thumbnail Length                : 16004
Image Width                     : 256
Image Height                    : 213
Encoding Process                : Progressive DCT, Huffman coding
Bits Per Sample                 : 8
Color Components                : 3
Y Cb Cr Sub Sampling            : YCbCr4:2:0 (2 2)
Image Size                      : 256x213
Megapixels                      : 0.055
Thumbnail Image                 : (Binary data 16004 bytes, use -b option to extract)

• save-from-ios-share

ExifTool Version Number         : 12.76
File Name                       : save-from-ios-share.JPG
Directory                       : .
File Size                       : 17 kB
File Modification Date/Time     : 2024:04:17 11:01:43+08:00
File Access Date/Time           : 2024:04:17 11:24:51+08:00
File Inode Change Date/Time     : 2024:04:17 11:24:49+08:00
File Permissions                : -rw-r--r--
File Type                       : JPEG
File Type Extension             : jpg
MIME Type                       : image/jpeg
JFIF Version                    : 1.01
Exif Byte Order                 : Big-endian (Motorola, MM)
X Resolution                    : 72
Y Resolution                    : 72
Resolution Unit                 : inches
Y Cb Cr Positioning             : Centered
Exif Version                    : 0221
Components Configuration        : Y, Cb, Cr, -
Flashpix Version                : 0100
Color Space                     : sRGB
Exif Image Width                : 256
Exif Image Height               : 213
Scene Capture Type              : Standard
Compression                     : JPEG (old-style)
Thumbnail Offset                : 304
Thumbnail Length                : 16004
Image Width                     : 256
Image Height                    : 213
Encoding Process                : Progressive DCT, Huffman coding
Bits Per Sample                 : 8
Color Components                : 3
Y Cb Cr Sub Sampling            : YCbCr4:2:0 (2 2)
Image Size                      : 256x213
Megapixels                      : 0.055
Thumbnail Image                 : (Binary data 16004 bytes, use -b option to extract)

[florihupf]

Same here. I reported this way back when and this issue is one of the main things i run into as it prevents to download images that are only on the server as it creates duplicates that are re uploaded.