Hello,
I was trying to make a thumbnail. 100 x 100 pixels. Even if I choose low quality jpeg for saving the size remains the same, more than 100 Kb. What I’m doing wrong?
Or just general question. What can influence image size besides quantity of pixels ?
Thank you for you reply
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The only other thing I know that goes into a JPEG, is the meta data that comes from the camera (aperture, shutter speed, camera model, dates, and so on). It’s highly unlikely that there’s enough data there to make much of a difference though. That said, if you’re using Photoshop, there is a ‘Save for Web’ option that will strip the meta data out. Right now though, I’m guessing something else is going on.
One other thing, the large the range of colours present, the larger the file size. Those with a more restricted range, are usually a bit smaller. It shouldn’t make that much difference though.
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That does seem large for a jpeg of that size.
The type of compression, and the nature of the image. Certain compression types work best with certain types of images.
The amount of compression is another factor.
Bit depth is another factor in filesize, each pixel will have so many bits per channel.
Which leads to the number of channels, most have 3 (RGB) but some images have more (RGBA).
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I have found tinypng.com to be very effective at reducing the KB size of PNG images and despite the name it also works on Jpegs
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If as you say the file size remains the same for different size images I would suspect the meta data as that will be basically the same in all the images. From memory the jpg image also contains a thumbnail image which will not help. Strip it all out; Imagemagick can do it if you want to use it.
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Is that the actual size of the file after you’ve saved it, or is that the size that your editing software shows? I’ve been confused in the past because GIMP sometimes shows a much larger file size than I would expect while I’m working on an image.
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Are you using a server-side language (eg PHP, etc) to make the thumbnail, if so which language and what code are you using to generate the thumbnail?
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What software are you using?
Can you provide us with a link to the original image and your thumb attempt? We may be able to spot something.
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Thank you for all your responses! I use Photoshop to create thumbnails. It’s thumbnails for the catalogue, so I need to create several thumbnails at a time . I have an action and a droplet to automate the process. But only some of images give thumbnails with considerably bigger size.
I think I should try to review my Photoshop action and make save for web.
I can’t give an example now. The described problem happens at work, on Mac. At home I , on my PC computer I didn’t have that problem. And I didn’t have the same images.
Anyway, If I still have an issue with thumbnail size I’ll give an example here.
Thanks again!
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