Problem with file coversion

  • 1
  • Problem
  • Updated 2 years ago


I have a problem with file coversion.

When I’m changing the size of the picture from big one to the small one for example 800 x 800 mpx to 200 x 200 mpx, the picture losts the quality of it. When I want to change to the previous size (e.g 800 x 800) , the quality doesn’t change at all. I usually use „Free transformation of the picture” option in Photoshop to do that.

I have CS5 Photoshop and already tried to re-establish factory settings and it didn’t help me.

I attach images:

NUMBER 1: Original size

NUMBER 2: After using option „free transformation of the picture”

Could you help me with this?

Thank you.
Photo of Dorota


  • 1 Post
  • 0 Reply Likes

Posted 2 years ago

  • 1
Photo of Steve Lehman

Steve Lehman

  • 764 Posts
  • 92 Reply Likes
Do you realize that when you switch from 800 pixel 200 pixel that's switching to a lower resolution?
Then when you have it in low resolution, and then when switched back to high resolution it stays the same as the low resolution and has pixels running through it, because you are sizing a low resolution to a bigger size where it cannot be sized big while it is a low resolution photo.   

That's the same as a high resolution of 300 dpi and then sizing the same picture to 72 dpi, you cannot go back to the higher resolution.  That's because you cannot reinvent dots in the picture.  

If you don't understand this in this way, consider that you have 72 dpi in a picture, those dots are big to make that picture in low resolution.  Smaller the dots make a finer picture in higher resolution (300).  Once the picture is fine with smaller dots, then you make those dots bigger with lower resolution at 72 dpi, then go back to 300 resolution, the dots don't just re-size themselves.  
The dots for a fine picture need to be there.  But in 72 (low res) the dots are being tossed out.  

Resolution is the hardest thing for anyone to understand.  I know you have a big software program but it seems you are not dealing with size carefully.  Most pro's deal with inches rather than pixels.  It makes everything sensible.  

I make my photos in TIFF format because I don't want the resolution to change, as TIFF is uncompressed format and has high or low resolution.  YOu are probably working with JPG which is wrong even if your friend told you to do so.  

If I used JPG, the format would change from 300 to 72 and not back again.  But in TIFF the resolution can change low to high without degradation.   Comprehend?  

I suggest you use TIFF format which does not compress or change resolution value.  Most pros know to use an uncompressed file format like TIFF.  

There is also PDF-none with no-compression, but don't confuse that with PDF-JPG format (or PDF-GIF) which will retain the format for a portable document photo but will later change in size as the recipient changes it to JPG again.   The more you change JPG the lower the resolution gets.   After 2 or 3 changes, you won't have much of a JPG photo left to show.  

Also, if you are using a phone photos, those are 24 dpi resolution and only meant for a screen of 1x1 inch square.  Nobody can print those to a larger size.  Phone photos in high quality resolution are really 72 dpi photos and can be printed but lose their resolution the more they are worked.  work your photos like a professional, and stay with uncompressed formats like TIFF.  Nobody can do much with phone photos.  They are the lowest resolution and won't print well or be edited well. 

I have 24 years with photos, with 8 engineering certifications, 4 years technical college, worked at Microsoft, was on loan at Adobe, and own a company that deals with digital photos each day.   Please take my advice.   Work with TIFF format.   

Steve Lehman, MCSE engineer responding