Awesome Astrophotos: A Negative Sun

Article written: 24 Jul , 2011
Updated: 24 Dec , 2015


Here’s an unusual if not stunning way to look at the Sun: César Cantu from the Chilidog Observatory in Mexico has taken a few images of the Sun, and reversed the colors, or made a negative. This increases the contrast and allows structures to be seen — or at least stand out — that otherwise are not visible.

“The picture is made under normal procedure,” César tells us. He creates an Avi file, then reverses the colors, and also applies false color, leaving the sky to look blue and the Sun to yellow-orange and the chromosphere as red. “This is to delight the author!” César says.

The solar prominences, in all sorts of shapes and sizes, really stand out.

Below, you can see a comparison of “normal” image which has then been “negativised.”

A comparison between a regular and 'negative' image of the Sun. Cesar Cantu from Monterrey, Mexico, and the Chilidog Observatory. Click for high resolution version

Thanks to César for sharing his stunning images. See more at his website, Astronomía Y Astrofotografía.

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16 Responses

  1. Torbjörn Larsson says

    Makes it look like some odd fruit or egg cell.

    I like it!

  2. HeadAroundU says

    sponge-biscuit or orange

  3. HeadAroundU says

    sponge-biscuit or orange

  4. Paloma Díaz Cervantes says

    El comentario es más para César.
    César, podrías añadir a tu página un espacio de comentarios para la gente que visita tu página pero que no es miembro? Gracias. He visto tus fotos y son maravillosas. Soy estudiante del IAUNAM y es lindo ver que hay gente apasionada en esta área. Las fotos astronómicas no son nada fáciles y tu tienes muchas de gran calidad y calidez. Te felicito!!!

  5. Jose de Jesus says

    Great job! It is a wonderful image that shows the active regions very fine. Congratulations!

  6. Wayne Robert Smith says

    Slow news day frasier? This is slack and thin on info even for Universe Today. This site has really gone down hill since BA took over.

    • Member
      Steve_Nerlich says

      This image gratefully distracted me from reading more about some self-obsessed nutter gunning down ninety plus people in Norway. Yay UT – and whoever the heck is BA is… carry on.

  7. Anonymous says

    It really brings out the convection cells, I think this should be the norm for presenting heliopics.

  8. squidgeny says

    Never mind the troll. If his short post history is anything to go by, this user likes using inflammatory language and is probably just looking for attention. Report his posts as trolling and they’ll (hopefully) get removed.

  9. Anonymous says

    Every post he’s made has been on this theme. Next one like this gets him banned. He can make his own site if he feels he has better news.

  10. ITSRUF says

    Cool Pic. Neat idea!

  11. Radu Motisan says

    great, but nothing new. probably now he will also try other Image processing techniques such as segmentation of convolution matrix ops. I thought there’s a standard in handling these images.

  12. Anonymous says

    I believe BA is a site called “Bad Astronomy”…. Am I wrong? I’ve been with UT since its inception and I’m always thrilled to read the articles and wonderful pictures…. Good Job Universe Today!!

  13. Anonymous says

    Is there a way to get foreign languages in English so that those of us who don’t speak a foreign language can understand what is being said (or typed)? 🙂

    • Anonymous says


      it translated to this:
      The comment is more to Caesar.
      Caesar, you could add your comments page a space for people who visit your site but not a member? Thank you. I’ve seen your photos are wonderful. I’ma student and it’s nice IAUNAM see that there are passionate people in this area. The astronomical photos are not easy and you have many high quality and warmth. Congratulations!

      • Anonymous says

        Thank you so much Olaf2! I didn’t even know that existed. As the saying goes, “you learn something new every day”! I really do appreciate it, I’ve found myself several times not knowing what someone is saying due to using another language that is not my own. Again, bunches of thanks!

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