Is it possible to make a .jpeg photo smaller without losing quality ?
I have an image with 1274px in height I want to change its height to 200px without losing quality.
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The confusion (dont worry the confusion is common) here is that your refering to pixels in two different contexts,
This is not sane. Fortunately makers of PDF have a differwent world view and they call length dimensions points, inches, mm, cm or something other. Oncer you reformulate your question as:
I want the height of my image to be 200 points
It all makes sense now, even you can google the answer after this change.
Basically just open the image and choose Image -> Image Scale. Uncheck resample and type a height of 200 points,or whatever linear unit youyr using as base scale.
Note: A pixel has no size so scaling a pixel is meaningless.
PS: Why on earth your image is a jpg? This is a completely separate issue offcourse. thing is you have a vector drawing to beging with why make it rasterized?
if you reduce the number of pixels in your image you will lose quality. Think that pixels are oranges and your image is a crate; you cannot fit the same amount of oranges in a smaller crate.
However, you can minimize the quality loss by following a few steps. Resize your image to the correct size. Say you're going to use this image in a website, if you're going to display it at 400px height then that is the correct size for your image.
Avoid JPEG quality loss: export your image with higher quality / less compression. That can be set in the Save for Web options.