Hey folks! I’m working on a Telegram bot using a Java library. I’ve got it set up to receive and send photos, but I’m running into a problem. The images I download are coming out smaller and lower in quality than the ones originally uploaded.
Here’s what I’m doing:
- I receive the photo from a user
- I download it using the bot API
- I save it as a blob in my database with JPA
- Later, I retrieve it and send it back to users
The weird thing is that the image looks fine when first received, but after storing and retrieving it, the quality drops significantly. I’m using standard methods to process file streams and byte arrays.
Has anyone else experienced this issue? Any ideas to help maintain the image quality during this process? Thanks in advance for your help!
As someone who’s worked extensively with Telegram bots, I can tell you that image quality issues are a common headache. In my experience, the culprit is often how we handle the file after receiving it from Telegram.
One thing that worked wonders for me was using the getFile method to fetch the file_path, then downloading the file directly from Telegram’s servers using that path. This way, you’re getting the highest quality version available.
Another trick I’ve found useful is to avoid any unnecessary processing or conversion of the image data. Store it as raw bytes in your database and send it back the same way. I’ve seen cases where seemingly innocuous operations can trigger compression.
Also, don’t forget to check your database configuration. Some setups might automatically compress large binary objects, which could explain the quality drop after retrieval. It might be worth tweaking these settings if that’s the case.
Lastly, have you considered using file_unique_id for storage instead of the actual file content? This can save space and avoid quality issues altogether, though it does rely on Telegram retaining the file.
I’ve encountered a similar issue with image quality degradation in Telegram bots. The problem often lies in how Telegram handles image compression. When you download an image through the Bot API, you’re typically getting a compressed version, not the original file.
To maintain quality, try requesting the highest resolution version available using the getFile method with the file_id of the largest photo size. Then, download that file directly from Telegram’s servers.
Also, ensure you’re not inadvertently recompressing the image when saving it to your database or sending it back. Store the raw bytes and send them as-is. If you’re using a specific image processing library, check its default settings – some automatically compress images.
Lastly, consider implementing a check to compare file sizes before and after processing. This can help pinpoint where the quality loss is occurring in your workflow.
hey mate, i’ve dealt with this before. telegram compresses images by default. try getting the file_path with getFile() and download directly from telegram’s servers. that usually gives you the best quality. also, make sure you’re not accidentally compressing the image when saving to your db. store the raw bytes if possible. goodluck!