CODEWITHSUNDEEP
image-processingbitmapbase64type-conversionjpeg
AshOoO
AshOoO

Reputation: 1148

Save image from bitmap to jpeg without save the file

I have a problem that I need to have a jpeg image with dpi 500 first it come from base64 I could converted it directly to jpeg but I don't know how to set the dpi to system.drawing.image

I have a solution is to get the image as bitmap then use the setresolution function to reset it to 500*500 and that what I need but to reconvert the bitmap again to jpeg it needs to be saved on physical drive and also I couldn't do that

so I just need to get from image or bitmap to jpeg with 500*500 resloution actually I also will read it again to array of bytes but I need this array from a jpeg image with 500*500 dpi and the converted image from base64 is not 500*500 dpi

any idea will be appreciated

Upvotes: 0

Views: 493

Answers (2)

Michael
Michael

Reputation: 54725

Seems you have some misunderstanding what dpi means. 500 means that each inch of an object in an image is represented using 500 pixels. So, dpi isn't really a characteristic of an abstract image. It's a characteristic of how a real object is represented with an image. That means you don't need to change image's resolution at all.

Upvotes: 1

Guffa
Guffa

Reputation: 700680

The Image class is abstract, so you can't have an instance of that class. What you have is really an instance of the Bitmap class, but a reference to that with the type Image.

So, you just have to cast the reference to the actual class of the object, and you can access its methods:

((Bitmap)theImage).SetResolution(500, 500);

Upvotes: 1

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