Hi Shaikat

If you don't have Photoshop, you can use free Irfanview to change image DPI. Go to Image -> Resize/Resample... in the menu. Now set DPI value on the bottom of dialog.

thank you very much

Dear Shaikat,

DPI is the ratio between the number of points (pixels) in a line and the true dimension of the line (in inches) in the real object. Hence, if your DPI value refers to the density at which the image was originally acquired (for instance through a scanner), you can't change it. Please be aware that changing the value as suggested above doesn't actually change the image density; it just lets the printer or software know the intended size (in inches) of the image.

You can reduce it in a lossy compression. If you want to increase it, take another picture.

Hello Debnath

This is my channel named MOMENT_ON_PROTEOMICS.

Well, as you need, I have the best answer to do so in the simplest way.. watch this video and if you like, subscribe that Channel.

https://www.youtube.com/watch?v=tbSOvUSQJIk&index=19&list=PLQLtIQhMOBQ7QVRZKtbZfw5KqNSqg6FTG

I use IrfanView a free program https://www.irfanview.com/ for converting many photo . You can convert images between different formats, also batch crop, change size, set dpi, change color depth and more. From file menu chose batch conversion,rename/advanced/set new dpi and set it to 300 or more. As shewn in the following screenshots

For one Image you can use the following sequence, from file menu , open file, from image menu select resize/re-sample change dpi as you need. As shown in the following screenshots

Please see this video. The easiest way to convert PowerPoint slide to high resolution TIFF (300dpi) is shown

How to Convert Powerpoint to TIFF

https://youtu.be/pd_CpCH5Jbw

Use this toolbox! it work perfectly to generate high-resolution images (up to 1200 DPI) and its free. The best I've ever used!

https://www.xltoolbox.net/

Watch This Video

🔴 How To Increase DPI Of An Image - TIFF or PNG

https://youtu.be/qreaTWn0DPw

Here is a very nice video of a webpage. No need to download any software

(https://www.youtube.com/watch?v=l5xRRTRR13o)

You can do it simply by using irfan view software, i think that would help you. Moreover, you may also find the related videos on you tube.

When you increase the resolution of an image it can only look the same or worse. The intention of asking for high resolution images is to have clear images that can be resized or printed without distortion or pixelation. A fuzzy, pixelated image will look the same but with lots of pixels. Some programs can do some upscaling to improve appearance but it has its limits and it performs worse on images with lines or with a lot of contrast. At the end, crap in, crap out.