HELP! Photos get blurrier when uploading to CT

Discussion in 'Ancient Coins' started by Romancollector, Dec 3, 2020.

  1. Romancollector

    Romancollector Well-Known Member

    Hello everyone,

    I've noticed that my photos become blurrier when I upload them while I'm creating thread on CT. When I do a side by side comparison of the photo on CT vs. the same photo in my forum gallery, the CT photo appears to be blurrier. Does anyone know if there is a specific reason for this, or how to fix this?

    Thanks for your help!
    Rc
     
    SensibleSal66 likes this.
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  3. SensibleSal66

    SensibleSal66 Well-Known Member

    What kind of file are they ? jpeg ? What file are they uploading from ?
     
  4. Romancollector

    Romancollector Well-Known Member

    No. They are PNG files, and they're all from my computer (I have a mac, not sure if that is of any relevance).
     
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  5. SensibleSal66

    SensibleSal66 Well-Known Member

    I upload jpeg and have no problem with blurriness .
     
    Romancollector likes this.
  6. desertgem

    desertgem MODERATOR Senior Errer Collecktor Moderator

    Post a sample file here. Are they photos you took yourself ( what original size). Did you use a processing program? If taken thrugh other than a camera lens ( such as a USB camera, what was the MP value of such. Jim
     
  7. Romancollector

    Romancollector Well-Known Member

    @desertgem Ok, here is one example. The top is saved with PNG, the bottom is JPEG. I just resaved the photo as a JPEG now. Maybe @SensibleSal66 was right to upload JPEG instead?

    I take the pictures on my phone and edit out the background in an app. Then I add them to a blank background on powerpoint where I save the picture as an image. I know my method is not very high tech, but I haven't found an app that does the trick. I'm not quite sure how to figure out the megapixel value, the only thing I can see is the photo size in KB.

    Octavian denarius enlarged.png
    Octavian denarius enlarged.jpg
     
    Last edited: Dec 3, 2020
    DonnaML and Bing like this.
  8. dougsmit

    dougsmit Member Supporter

    Just for our education, post side by side PNG and JPG converted from the PNG and JPG that was JPG from the start. All must be the same size. Your Augustus posting has a smaller JPG. I assume you are shooting RAW since it would seem odd to take a camera original JPG and convert it to PNG for posting here.

    For the record, I shoot RAW, convert and edit as TIF and save the result as JPG. Then I trash the TIF since it can always be redone from the RAW.
     
    DonnaML likes this.
  9. Romancollector

    Romancollector Well-Known Member

    When I insert the photos on my background in power point and save them, they are automatically saved as PNGs. I simply, resaved the image as a JPEG as it was in powerpoint, I did not change the size or anything, so I'm not sure why the JPEG is smaller.
     
  10. SensibleSal66

    SensibleSal66 Well-Known Member

    I use an editing Program (free) to change the size if need be .
     
    Romancollector likes this.
  11. Romancollector

    Romancollector Well-Known Member

    Thank you, can you please let me know what the program is?
     
  12. Valentinian

    Valentinian Supporter! Supporter

    When using Mac's "Preview" it sometimes defaults to save in png, when jpg is much more efficient. At the "save as" step change the file type to jpg and I think you will get better images in far fewer bytes. Mac's, which I use, do many things very well, but I do not think using the png format is one of them.
     
    DonnaML and MIGuy like this.
  13. Romancollector

    Romancollector Well-Known Member

    Thank you @Valentinian ! I'll save everything as a JPEG from now on!
     
  14. desertgem

    desertgem MODERATOR Senior Errer Collecktor Moderator

  15. RichardT

    RichardT Well-Known Member

    As I understand it, editing and saving a photo will almost always result in compression of the file and loss of sharpness.

    You can observe this yourself by noting the file size of your photo before and after each editing step is done.

    I think the editing in Powerpoint might reduce the photo size by quite a bit.
     
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