Skip to main content
Max Mugen
Max Mugen
Inspiring
August 22, 2023
Answered

"crop image" randomly creates a white border

  • August 22, 2023
  • 2 replies
  • 2210 views

sometimes, when i use the crop image function on a png image embedded,  it works and the image is cropped but I get randomly on either one side of the image a 1px border that is created. 

It is random and unpredictable, and if I go back to original size and crop it again, it sometimes not do the white border
it can appear on one of the four sides of the image 

Is there a way to fix that ? 
is the Adobe team aware of the problem and will fix it one day ? 

Normal png file size, win 10, latest AI version 

Thx 

This topic has been closed for replies.
Correct answer Ton Frederiks

This often happens with images that have a resolution that is not a multiple of 72 ppi (like 144 or 288 ppi), but 150 or 300 ppi. When cropping, fractional pixels are calculated resulting in white line(s) at the edges.

Masking will give a better result.

2 replies

Ton Frederiks
Community Expert
Ton FrederiksCommunity ExpertCorrect answer
Community Expert
August 22, 2023

This often happens with images that have a resolution that is not a multiple of 72 ppi (like 144 or 288 ppi), but 150 or 300 ppi. When cropping, fractional pixels are calculated resulting in white line(s) at the edges.

Masking will give a better result.

    Max Mugen
    Max MugenAuthor
    Inspiring
    August 24, 2023

    thank you for your answer ! nice to know
    Just out of curiosity, should I understand that 72PPI is the base for math operations and computational calculation inside AI ?
     my images are indeed 300PPI 

    -- maxmugen.com
    Max Mugen
    Max MugenAuthor
    Inspiring
    August 24, 2023

    Yes 72 points per inch is the base. When Illustrator was created, the first Macintoshes had a screen resolution of 72 pixels per inch. So the 100% size on screen matched the printed output. That does not matter anymore, but the 72 was kept to decide the size of a pixel (a pixel does not have a fixed size untill you tell how many of them fit in an inch or centimeter). 

    When working with images/pixels in Illustrator 72 or multiples thereoff are the best to work with.

    There should be no visible difference between 288 ppi and 300 ppi images.


    thank you very much for the technical info, very appreciated ! 

    -- maxmugen.com
    Monika Gause
    Community Expert
    Monika GauseCommunity Expert
    Community Expert
    August 22, 2023

    It probably wasn't snapped exactly to the image pixels. Or maybe you are also resampling the imageß

      Terms & ConditionsAccessibility statement
      Using the community Terms of use Privacy Cookie preferences Do not sell or share my personal information ad choicesAdChoices