Level 50
Which image format are you encoding from?
Oct 25, 2018
7
Level 2
Image uploading with Intervention - how to maintain DPI
I am uploading images using Intervention Image. I am not resizing them at all but I am encoding them (encode('jpg', 100) and streaming them to AWS S3 (stream('jpg', 100).
My source images have a DPI of 350. The uploaded images have a resolution of 96. Why is this and how can I maintain the resolution of the uploaded image?
Level 2
Usually JPG.
Level 50
if they are already jpg, why encode them to jpg? I am no image expert, but jpg is not a lossless format, so could it be that you lose some details in the encoding?
Also, can you separate the process to determine if the reduction happens in the encode() step or the stream() step? Or both?
Level 122
do jpg files even have dpi?
I think not.
In this thread https://stackoverflow.com/questions/27323561/do-pngs-or-jpgs-have-a-dpi-or-is-it-irrelevant-when-building-for-retina. it is said that there can be metadata in the jpg file which indicates at what dpi the image was built.
Maybe the action of streaming the file loses the metadata?
1 like
Level 2
Even if I just save the file to local disk, no encoding, just $img->save('/path', 100) my image DPI reduces to 96, despite the original being much higher DPI than that.
Level 122
but jpg are fixed pixel dimensions - they don't have DPI
Level 1
I am Saving the real image as like this
$image->move($destinationPath, $fileName);
And it is saving the real image...
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